The Hamas militant group said Saturday it has accepted a new Gaza ceasefire proposal from mediators Egypt and Qatar, but Israel said it has made a counter-proposal in "full coordination" with the third mediator, the United States.

Israel broke its ceasefire with Hamas in Gaza last week and has been pounding Gaza with airstrikes since, killing more than 800 people. Israel has vowed to escalate the offensive if Hamas does not release hostages, disarm and leave the territory.

Israel launched its most intense airstrikes on Gaza since the January ceasefire, killing at least 44 people. Hamas warns the attacks threaten ongoing hostage negotiations as regional tensions escalate.