On Nov. 11, 2012, the IDF targeted Ahmed Jabri, the head of Hamas' military wing, in the Gaza Strip. Jabri was a senior Hamas operative who served in the upper echelon of the Hamas' command. Israel claims he was directly responsible for executing terror attacks against Israel in the past.
Check out the footage of the aerial assassination that targeted Jabri's car:
The assassination is apparently part of a much broader series of assaults from Israel against militant in the Gaza strip. From the Guardian
The assault on Gaza appears to be ongoing. Since Donnison's tweet of about 20 minutes ago, he has reported one more "explosion" in the north. A Twitter list of 421 people inside Gaza contains many mentions of new explosions.
Al-Jazeera reports that a rocket has been fired from Gaza into Ashkelon, over the northern border.
Al-Jazeera now reports that Israeli air raids continue on Gaza. It appears that a major offensive, called "Pillar of Defense" by the IDF, is indeed under way.
Hamas has stated that Israel has 'Opened the gates of hell' and is promising revenge attacks.