Israeli forces launched an air strike on the Gaza Strip early on Friday, wounding two people, Palestinian medics said.

Two members of the Islamic Jihad`s armed wing, the Al-Quds Brigades, were wounded in the helicopter attack, Gaza`s emergency services and witnesses said.

An Israeli military spokesman confirmed there had been an air raid but did not immediately provide further details.

As violence continued to rock a five-month-old truce, Israel maintained a complete closure of the Gaza Strip, preventing delivery of fuel and humanitarian supplies.

The United Nations, which has been unable to bring in supplies since Israel sealed off the territory on November 5, has said it suspended its food distribution to half of Gaza`s 1.5 million people.

Israeli Defence Minister Ehud Barak decided on Thursday night to keep the crossings closed after four rockets were fired at southern Israel, a military spokesman said.

The rockets did not cause any casualties or damage.

Israel had said it would allow 30 trucks to deliver supplies to Gaza on Thursday after it sealed off the Gaza Strip on November 5, but later said rocket and mortar fire by Gaza militants made it impossible to do so.

Israel also cut off European Union-funded fuel supplies to Gaza`s sole power plant on Thursday, prompting it to shut down for want of diesel.