Palestinian authorities said a grave site discovered at the Nasser hospital, the main medical facility in central Gaza, contained nearly 400 bodies
In Gaza, there was no immediate confirmation from Hamas and other Palestinian militant groups that they had agreed to halt 10 days of cross-border warfare.
"There is an agreement for a ceasefire beginning tomorrow. I believe it is six in the morning (0300 GMT)," said the official, who asked not to be identified. The official said Israeli leaders approved a truce after a senior Israeli delegation held talks in Egypt.