Israel has introduced what it said was a new U.S. ceasefire plan and is trying to force Hamas to accept it by imposing a siege on the Gaza Strip.

Israel will stop the entry of all humanitarian aid into Gaza to pressure Palestinian militant group Hamas into accepting a temporary extension of the ceasefire agreement, officials said on Sunday, a day after the initial phase of the truce expired.

UN Secretary General António Guterres, who has arrived in Cairo for Tuesday's emergency Arab summit on rebuilding Gaza, called for the "immediate" resumption of assistance. He urged "all parties to make every effort to prevent a return to hostilities".