TEL AVIV/CAIRO, July 4 (Reuters) - At least 15 Palestinians were killed overnight in an Israeli airstrike in Gaza, according to local health officials, as U.S. President Donald Trump said he expected Hamas to respond to his "final proposal" for a ceasefire in Gaza in the next 24 hours.

President Donald Trump previously said Israel had agreed to a ceasefire deal, but Israeli leader Benjamin Netanyahu still has not confirmed Trump’s claim.

Hamas on Friday said it was ready to start talks "immediately" on a proposal for a ceasefire in Gaza, where the civil defense agency said Israel's ongoing offensive killed more than 50 people.