Okay, so, In the first quarter of 2015, Israeli occupation forces killed one Palestinian civilian and wounded a further 16 in the Gaza Strip. In the three months January-March, there were six military incursions - when Israeli forces invade the Gaza Strip then withdraw - and 67 shooting attacks on land and at sea (these are conservative figures, taken from UN OCHA, PCHR-Gaza, and media sources). (x)
And so, hours ago, “A rocket was fired from Gaza. Unclear by who or if it’s retaliation for Israel’s hundreds of ceasefire violations” (x)
Thus, Israel, being well Israel, decided to bomb most of Gaza.