Israeli air strikes hit Hamas leader's office

Israel has targeted the headquarters of Hamas leaders and other key facilities in Gaza, on the fourth day of Israeli air strikes in the coastal enclave.

Prime Minister Ismail Haniya's office, which Egypt's PM had visited on Friday, was among the buildings destroyed.

At least 38 Palestinians and three Israelis have died since Israel killed Hamas's military chief on Wednesday.

Israel earlier put 75,000 reservists on stand-by amid speculation of an impending ground invasion.

The BBC's Jon Donnison is in Gaza and says he saw extensive damage to the Hamas leader's office and in the Jabaliya refugee camp.