GAZA CITY - HAMAS, the Islamist movement controlling Gaza, said it is ending its six-month truce with Israel on Friday and will respond to any attack on the impoverished and besieged Palestinian territory.

Hamas has also ruled out any extension of the Egyptian-mediated ceasefire, which began on June 19 but has seen repeated violations in recent days, with Israel launching air strikes in response to rocket and mortar attacks.

'The truce will end tomorrow,' Hamas spokesman Fawzi Barhum said on Thursday.

'There is no possibility of renewing the truce,' he told AFP after a meeting with Islamic Jihad and other factions in the densely populated enclave.

Both Hamas and Israel have said they would respond when attacked, but neither has yet said it will go on the offensive.

'We at Hamas have the right to respond to any Zionist aggression against the Palestinian people. It is a national duty,' Mr Barhum said, adding that Hamas would act 'according to the situation on the ground.'

Mark Regev, spokesman for Israel's interim Prime Minister Ehud Olmert, said the cabinet would discuss the situation on Sunday.

'We were ready to respect the arrangements concluded with Egypt,' he told AFP on Thursday.

Israeli Defence Minister Ehud Barak has indicated that Israel would respond if attacked, saying: 'When the situation requires us to, we will act.' He raised the spectre of Israeli military intervention, but also made it clear he saw no urgency.

'We are not afraid of launching a large-scale military operation in Gaza but there is no need to rush into it,' he told journalists.

Israeli forces conducted several air strikes and killed one Palestinian while Gaza militants fired a barrage of rockets on Wednesday and again on Thursday.

Israeli warplanes on Thursday knocked out two rocket launchers, including one that was set to fire, the military said.

Israel and Hamas have accused each other of violating the truce that was negotiated through Egyptian intermediaries because the Jewish state regards the Islamists as a terrorist organisation.

The Israeli government blames Hamas for not stopping attacks often carried out by smaller Palestinian factions, while the Islamists claim Israel also broke the truce by failing to lift its blockade of the impoverished territory.

Israel responded to a surge of violence in early November by tightening sanctions and closing crossing points with Gaza, halting deliveries of humanitarian aid and other supplies.

The UN Works and Relief Agency said on Thursday shortages caused by the closures have forced it to suspend distribution of food assistance to about half of Gaza's 1.5-million-strong population.

UN Middle East envoy Robert Serry warned that 'a major escalation of violence would have grave consequences for the protection of civilians in Israel and Gaza, the welfare of the Gazan civilian population, and the sustainability of political efforts.'

'A priority must be to ensure calm in and around Gaza and urgently improve humanitarian conditions,' he said in a UN Security Council brief delivered in New York.

Rockets have rained down on southern Israel almost daily since November 4, and Israeli forces have killed 18 Palestinians in Gaza, nearly all of them militants, since then.

On Wednesday two people were wounded when a rocket exploded near a large supermarket in Sderot, an Israeli city just a few kilometres from Gaza.

Palestinian president Mahmud Abbas will discuss the situation in Gaza when he meets US President George W. Bush in Washington on Friday.

Mr Abbas has called for the truce to continue, but his authority has been limited to the occupied West Bank since Hamas ousted his forces and seized control of the coastal enclave in June 2007.

The situation in Gaza and Palestinian factional divisions have further hobbled slow-moving Israeli-Palestinian peace talks revived under US auspices in November 2007 after a seven-year hiatus. -- AFP