Palestinian militants in the Gaza Strip fired between eight to 12 Qassam rockets at the western Negev, most of which landed in open fields. There were no reports of injuries, but a local structure sustained damage,

A Qassam rocket fired by militants on Sunday struck a residential yard in the southern town of Sderot on Sunday, leaving one person with light shrapnel wounds. Several other people were treated for shock.

Meanwhile, Israel opened a border crossing with the Hamas-controlled Gaza Strip on Monday for the first time in two weeks, allowing in a limited amount of humanitarian aid, U.N. and Palestinian officials said.

The move came ahead of talks in Jerusalem between outgoing Prime Minister Ehud Olmert and Palestinian President Mahmoud Abbas, who termed Israel's tightened blockade of the Gaza Strip a "war crime."

"It will last a matter of days. But then what?" Christopher Gunness, spokesman for the United Nations Relief and Works Agency (UNRWA), said of the new supplies.

Israel had threatened to keep the crossing closed again on Monday in response to ongoing rocket fire from Gaza.

A total of three rockets struck the Negev on Sunday, as violence between Israel and the coastal territory continued for a second week. Some 17 rockets and mortar shells hit southern Israel over the weekend, including four advanced Grad-type missiles.

Outgoing Prime Minister Ehud Olmert on Sunday warned Gaza militants against further breaches of a five-month truce, speaking shortly after the Israel Air Force killed four gunmen who were firing mortars into Israel from the coastal territory.

"We will not tolerate the price tag that terrorist organizations are attempting to set. We will strike anyone who tries to violate the truce," Olmert told ministers at Sunday's cabinet meeting.

The prime minister said he had told the Israel Defense Forces to present plans for various operations against Hamas' regime in Gaza, but gave no timeframe.

"We are not eager for battle but we do not fear it," Olmert said.