Black smoke rises from Gaza City Sunday morning, as Israeli tanks gather on the Gaza border.

Over in the southern Gaza town of Rafah, Palestinians wake up to a sea of destruction caused by Israeli air strikes.

A 72-hour truce between Israel and Hamas Islamist militants expired on Friday.

Now renewed fighting is jeopardizing international efforts to negotiate a lasting ceasefire.

Prime Minister Benjamin Netanyahu says that Israel will not return to talks until Hamas stops its cross-border rocket attacks.

(SOUNDBITE) (Hebrew) PRIME MINISTER BENJAMIN NETANYAHU SAYING:

"At no stage did we declare that Israel's military offensive was over. The operation will continue until its objective - the restoration of quiet over a protracted period - is achieved. I said at the beginning and throughout the operation - it will take time, and stamina is required."

Since Friday, Hamas has fired more than 100 rockets into Israel and Israel has killed 14 Palestinian