Analysts have warned that the group may increasingly turn to “soft targets” with large crowds, as seen in Westminster, Stockholm, Nice and Berlin, rather than protected areas with a high security presence.
Explosive devices using homemade triacetone triperoxide (TATP) have become a signature of the group’s largest European attacks in Paris and Brussels, and has been discovered in several foiled plots.
Police have confirmed at least 22 dead and 59 injured, including 12 children, although the toll could rise as victims remain in hospital and recovery work continues.
Officials have not yet publicly identified any of the victims, amid online appeals for information on dozens of missing people.
Among those killed is eight-year-old Saffie Rose Roussos, who was at the concert with her mother and sister, and 18-year-old Georgiana Callander from Manchester.
They were originally one of dozens of children and teenagers who had not been heard of since the explosion.
They include Laura MacIntyre, 15, and Eilidh MacLeod, 14, both from the Scottish island of Barra, Olivia Campbell, 15, Martyn Hett, 29, Chloe Rutherford, 17, Liam Curry, 19,Courtney Boyle, Philip Tron, Angelika and Marcin Klis and Wendy Falwell.
Facebook activated a safety check feature so that people can let their family and friends know they are safe, as the Twitter hashtag #MissingInManchester was used to track appeals.
Police have established a help centre at the Etihad Stadium, access Gate 11, for anyone who needs assistance in tracing loved ones.
Emergency numbers have been established for anyone who is concerned for loved ones on 0161 856 9400 or 0161 856 9900.
Police have also appealed for concert-goers and witnesses to provide them with any footage they have from the scene if they believe it can assist the probe.
To report any concerns about suspicious activity, call the anti-terrorist hotline on 0800 789 321.
What have police said?
Greater Manchester Police have urged people to stay away from a large cordon around Manchester Arena and Victoria station while investigations continue.
They are working with the National Counter Terrorist Policing Network and UK intelligence services to establish more details about the bomber.
Scotland Yard has put extra officers on duty in London in the wake of the Manchester bombing, including armed personnel.
Metropolitan Police Commissioner Cressida Dick condemned the attack as “utterly appalling”, adding: “My thoughts are with the people of Manchester as they try to come to terms with the horrific events that took place in their city last night.
“Our colleagues from Greater Manchester Police and their emergency services showed huge bravery as they ran towards the confusion and danger.
"We are providing every possible support through the counter-terrorism network as investigators work tirelessly to understand what has happened.”
How have politicians reacted?
All general election campaigning has been suspended ahead of the 8 June vote as a mark of respect to the victims, with flags flying at half-mast across the UK.
“While we experienced the worst of humanity in Manchester last night, we also saw the best,” she said, condemning the attacker’s “cowardice”.
The Prime Minister said it was among the "worst terrorist incidents we have ever experienced in the United Kingdom”, adding that police and security services were working to establish the full picture.
Andy Burnham, the Labour politician and mayor of Manchester, condemned the “evil act”.
“It is hard to believe what has happened here in the last few hours, and to put into words the shock, anger, and hurt that we feel today,” he added.
"These were children, young people and their families that those responsible chose to terrorise and kill.”
Mr Burnham urged Mancunians to “come together” following the atrocity, praising the actions of volunteers who have opened their homes to victims, flooded to blood banks and given families free rides around Manchester.
He announced a vigil to be held on Tuesday evening in Manchester’s Albert Square.
The Muslim Council of Britain described the attack as “horrific” and “criminal”.
“May the perpetrators face the full weight of justice both in this life and the next,” said secretary general Harun Khan.
Global politicians have been sending their condolences, including Vladimir Putin, Emmanuel Macron, Xi Jinping and Angela Merkel.
Ariana Grande, who had left the stage shortly before the explosion, tweeted that she was “broken”, adding: “From the bottom of my heart, I am so so sorry. I don’t have words.”
Musicians and celebrities across the globe voiced their shock.
Taylor Swift sent her “thoughts, prayers and tears”, while David Beckham said his thoughts were with all those affected.
Ellie Goulding, Katy Perry, Demi Lovato, Harry Styles, Nicki Minaj, Selena Gomez, Boy George and Lorde also sent their condolences, while Liam Gallagher tweeted that he is “in total shock and absolutely devastated”.
Peter Hook, of Manchester bands New Order and Joy Division, said that daughter “made it home safe” from concert, adding: “My heart goes out to all parents & those involved. Manchester stay strong.”
my thoughts and prayers go out to the families, victims and ariana grande and her crew working tonight in manchester.
ATTENTION: There are still children under the age of 18 who are without a guardian and are not answering their phones, people are posting pictures all over twitter of missing friends/family who attended the concert.
Taxis in Manchester are offering free rides home for those stuck and without a ride home.
The Holiday Inn is also taking in children without guardians, PHONE NUMBER: 0161 836 9600, as well as the locals of manchester are offering to take anyone in and/or buy hotel rooms for those in need.
I DO NOT CARE IF THIS DOES NOT GO WOTH YOUR THEME, PLEASE REBLOG. THERE ARE CHILDREN MISSING AND WORRIED PARENTS. THEY ARE ALONE AND SCARED. THIS SHOULDNT HAVE HAPPENED.
Estou aqui para dizer que oremos pelos mortos, pelos feridos e por todos aqueles que estão perdidos de suas famílias após o show e confusos com a situação. Independente de sua religião, orientação sexual ou etnia enviem amor e boas vibrações, com energia positiva, a todos no mundo e que os culpados pela tragédia sejam punidos dentro da lei.
Boa noite à todos.
I am here to say that we must pray for the dead, injured and all those who are lost from their families after the concert and confused by the situation. Regardless of your religion, sexual orientation or ethnicity send love and good vibes, with positive energy, to everyone in the world and those who are guilty of tragedy punished within the law.
omg. i just heard about manchester. holy fuck. the panic that must be felt by so many people who had friends/family at the concert and can’t get into contact with them. i’m just imagining like 12/13 yr olds super excited to go to the concert and screaming in excitement over tickets and getting dropped off by their parents and it’s meant to be so safe and now the parents who were waiting to pick their kids up after an amazing event they would talk about for weeks are now frantically trying to get in contact to find them. and this scenario is just running through my mind. and i’m blinking away tears. i hope everyone can find their loved ones safe and sound asap.
I honestly can’t digest the fact that 19 people have died and 50+ were injured at the Ariana show tonight, with a lot of people still missing, stranded and separated from friends/family. Concerts are a happy place, she has so many young fans too.. I can’t believe this is happening.
YOU ARE AN EMOTIONLESS ROBOT
YOU ARE A SLAVE TO YOUR OWN EGO
YOU ARE A ROTTING FUCKING BANANA
GO FUCK YOURSELF WITH SHARP OBJECTS YOU ABSOLUTE PIECE OF HEARTLESS SHIT
I can’t even put together a calm rebuttal to this shit. I just can’t. Kids died. Little kids who were having a good time with their friends and family innocently attending a concert and people naturally show compassion and empathy and he just.. shits on it. To make himself seem like some.. I don’t even know. Do you think this makes you look intelligent? You aren’t a critical thinker Greg you’re a fucking selfish brat. It drives me up walls thinking about how unfair life is that of course shitty assholes like you get to live nice long lavish fucking lives and these children died before they even really got to experience what living really is. Some of them could have been your fans. I just.. I’m beyond angry. I might delete this rant later because is this all fucking emotion and just.. fuck dude. You’re sick. You’re a sick old piece of trash and I once again need to take a step back for my own mental wellbeing.
I don’t even know what to say right now. May those who lost their beautiful lives rest in peace and their families, concert staff, Arirana Grande, her crew and everyone else affected recover from this tragedy soon. This is not what music stands for and although we don’t have exact information on the background of the attack yet, all I know is that attacking a concert where obviously mostly children and teenagers go to is VILE. This is no one’s fault except for the person who caused so much pain. I hope people are taking good care of each other and Ariana is okay. She has always wanted everybody to feel included at her concerts and living with the fact that your own fans die at your concerts that should have been one of the best days of their lives and their happy space is hard, extremely hard. But the world is standing together with Arianators and Ariana tonight. If the tour is cancelled and she needs time to recover, we are not gonna judge her. We are not gonna do a damn thing but supporting everyone. To the beautiful angels that lost their lives tonight: We will never forget you. Amen.
As someone who goes to around 20+ concerts a year, my heart is breaking hearing about this awful tragedy. Concerts are a time for you and your favorite artist to come together and appreciate their beautiful music. A safe, fun, and encouraging environment where if you’re not having the best day, a room full of strangers singing your favorite songs can bring you back to happiness. I am so so deeply saddened for the families and friends of everyone who lost someone tonight, and to everyone injured at this show. This is a terrible time, and if anyone out there affected needs anything my ask is always open. Love to Manchester, xox
Halsey was at the panic concert last night, spencer was at the panic concert last night, josh was at the one a couple weeks ago, josh was at their jimmy Fallon performance, the singer from pierce the veil was at their concert two nights ago, dallon and his family go to tøp concerts, halsey goes to tøp concerts
The alternative music industry is just one big happy family and it’s so pure
Aries: hiking, haircuts, waterparks, sushi, photography, watching comedies with all your friends, old bookstores Taurus: watching movies in dark rooms, making food for parties, sundresses, braids, music festivals Gemini: hanging out with friends at the beach, staying up all night, ice cream trucks, making chalk murals in the driveway Cancer: watching the stars with someone you love, cooking, lace, taking pictures of the beach on a cloudy day, rainbows, holding hands Leo: vacationing, trying a new restaurant, volleyball, getting sunburnt/tanning, summer camps, mini golf Virgo: FINALLY relaxing, volunteering, picking up friends at airport, writing a short story, fishtail braids, jacuzzis Libra: amusement parks, spa days, bikinis, visiting family, tanning, concerts, sunflowers, taking a walk with someone you love, sports Scorpio: new lipstick, listening to music with someone you love, random summer storms, effortless beauty, multicolored nails, road trips, scary stories around the campfire Sagittarius: parties, dancing, summer flames, traveling to a different country, crop tops, meeting new people Capricorn: fun summer jobs, starting new shows on netflix, cooking new dishes Aquarius: painting the sunset, driving a vintage hot rod, underground concerts, going to the pool, watering plants Pisces: smoothies, classical concerts, seeing old friends, sketching outside, flowers, driving to the city