JERUSALEM (AP) Israels military ordered a complete siege on the Gaza Strip on Monday, halting entry of food, fuel and supplies to its 2.3 million people as it pounded the Hamas-ruled territory with waves of airstrikes in retaliation for the militants bloody weekend incursion .

More than two days after Hamas launched its surprise attack from Gaza, the Israeli military said it had largely gained control in its southern towns where it had been battling Hamas gunmen. Israels vaunted military and intelligence apparatus was caught completely off guard by Hamas, resulting in heavy battles in its streets for the first time in decades.

Tanks and drones were deployed to guard breaches in the border fence to prevent new incursions. Thousands of Israelis were evacuated from more than a dozen towns near Gaza, and the military summoned 300,000 reservists a massive mobilization in a short time.

The moves, along with Israels formal declaration of war on Sunday , pointed to Israel increasingly shifting to the offensive against Hamas, threatening greater destruction in the densely populated, impoverished Gaza Strip.

On Sunday, strikes leveled much of the Gaza town of Beit Hanoun, which Israel said Hamas was using as a staging ground. On Monday, the Israeli military blared messages to residents to evacuate Rimal, a residential and commercial district of central Gaza City where offices of The Associated Press and other international media are located, a signal that heavy strikes were to come.