Israeli troops shot dead an unarmed Palestinian infiltrating Israel from the Hamas-controlled Gaza Strip, the army said, the first fatality along the frontier since a June 19 ceasefire.

A Hamas spokesman said the killing was "a serious challenge" to the Egyptian-brokered truce.

An Israeli army spokesman said the man crossed the fence dividing Israel from the Gaza Strip rather than a crossing point. They fired at him after he refused their calls to stop and only later saw that he had not been carrying a weapon.

The Palestinian medical liason office said they had been informed by the Israeli army that a Palestinian had been shot dead in the early morning near the Kissufim border crossing.

His body was later transferred to a Gaza hospital.

The ceasefire deal calls on Hamas to prevent cross-border rocket fire and attacks from the Gaza Strip and for Israel to halt its raids and ease an economic blockade of the impoverished territory.

"Hamas and other factions are continuously evaluating the situation and will make the decisions that will secure the protection of our people," Hamas spokesman Sami Abu Zuhri said after the Palestinian was killed.

Sporadic rocket and mortar bomb attacks from the Gaza Strip since the truce began have led to brief closings of its border crossings, where Israel tightened restrictions on the passage of people and goods after Hamas seized the territory a year ago.

Abu Zuhri said a Hamas delegation met Egyptian chief of intelligence Omar Suleiman in Cairo last night and urged Egypt to press Israel to stop closing crossings and to abide by the ceasefire.

Until Israel carried out its obligations under the truce deal, Abu Zuhri said, "there would be no chance" of resuming indirect talks on the fate of Gilad Shalit, an Israeli soldier seized by Gaza militants two years ago.

Hamas is seeking the release of hundreds of Palestinians held in Israeli jails in exchange for freeing Shalit.

In the city of Nablus, in the occupied West Bank, Israeli troops raided several charity organisations and a medical clinic and closed down a local television station, Palestinian officials said.

Over the past several days, Israel has raided 15 Nablus charities over their suspected ties with Hamas.