Hamas chief Ismail Haniyeh insisted that the death of three of his sons in an Israeli air strike would not influence truce talks in Gaza, as bombardments on Thursday rocked the Palestinian territory.

Israel confirmed the killings, which came as talks in Cairo for a temporary ceasefire and hostage release deal drag on without signs of a breakthrough.

Speaking to Qatari broadcaster Al Jazeera, Haniyeh suggested that the strike, which also killed four of his grandchildren, was an attempt to shift Hamas’s negotiating stance.

“If they think that this will force Hamas to change its positions, they are delusional,” he said.

US President Joe Biden said Hamas “needs to move” on the latest truce proposal, which the Hamas group has said it is studying.