Militant group Hamas' chief negotiator held talks with Egyptian mediators over a potential ceasefire in the Gaza war on Wednesday while Israel struck the territory's main city prior to a planned takeover and again invited Palestinians to leave.

It may also reflect the reservations of Israel’s military chief of staff, Lt. Gen. Eyal Zamir, who reportedly warned that expanding operations would endanger the remaining 20 or so living hostages held by Hamas and further strain Israel’s army after nearly two years of regional wars.

Israel's new offensive in Gaza City could take weeks to start, leaving the door open for a ceasefire, officials say, even as Prime Minister Benjamin Netanyahu said it would get underway "fairly quickly" and end the war with Hamas' defeat.