Breaking Story: BBC PagesPalestinians say Israeli F-16 bombers have launched a series of air strikes against key targets in the Gaza Strip, killing and injuring dozens of people.
Missiles hit security compounds run by the militant group Hamas in the centre of Gaza City, killing at least 40 people, Hamas officials said.
The strikes, the most intense Israeli attacks on Gaza in recent times, come after the expiry of a truce with Hamas.
Israel has threatened an offensive to stop the firing of rockets from Gaza.
This has been brewing for the last couple of days as rocket attacks from Gaza have gone on despite Israel warning of retaliation.