GAZA (Reuters) - Gaza schools damaged by Israeli bombing will be exposed to the cold and rain this winter unless Israel relaxes its blockade to permit the import of windows, doors and building materials, officials said.

Palestinian students attend class at al-Taea school during the first day of the new school year in Khan Younis, in the southern Gaza Strip August 23, 2009. REUTERS/Ibraheem Abu Mustafa

Officials of the United Nations Relief and Works Agency (UNRWA) and Gaza’s Education Ministry say thousands of pupils face “darkness and cold” this winter in poorly lit and sparsely furnished schoolrooms.

Ministry spokesman Khaled Radi said more than 170 schools that suffered some damaged in the three-week Israeli offensive from December 27 to January 18 had not yet been repaired.

“The extent of the damage makes these schools unfit to face winter. Thousands of our children will have to study in rooms without electricity or heating,” Radi told Reuters.

“Many will sit at broken desks next to windows without glass.”

Israel restricts the import of cement, steel and other materials that could be used for military purposes by Gaza’s Islamist rulers, Hamas, who refuse to recognize the Jewish state and remain committed to armed struggle against it.

RECONSTRUCTION STILL WAITING

UNRWA runs nearly 200 schools in the Gaza Strip, educating about half of the enclave’s 450,000 students.

The agency said it had managed to obtain materials locally to repair most of the 50 schools damaged by bombs and artillery but some still need glass, cement and steel.

UNRWA Gaza adviser Adnan Abu Hasna said plans to build 100 new schools in Gaza to alleviate overcrowding in classes had been put on hold due to the Israeli blockade.

In one U.N.-run school in Jabalya refugee camp, home to more than 100,000 people, 14-year-old Ola Atteya said cracked walls and a roof of metal sheeting would make her classroom uncomfortable when the rains arrive.

Abu Hasna said efforts to convince Israel to allow essential building materials had so far been “useless.”

“We are in need of everything: cement, steel, glass, windows, wood, all sorts of building materials. They are promising us, but nothing is coming into Gaza,” he said.

Israel launched its offensive with the stated aim of stopping Hamas rocket and mortar fire at its southern towns. Thousands of houses, factories and government buildings were destroyed, including Gaza’s main cement plant.

Donor countries in February pledged more than $4 billion for the reconstruction of Gaza. But organized reconstruction remains on hold because of the Israeli blockade.

Israel wants Hamas to release captured soldier Gilad Shalit before it makes any concessions. He has been held for three years.

Sporadic rocket fire has continued since the offensive ended and Israeli air strikes have pounded smuggling tunnels in southern Gaza which bring in all sorts of goods.

The U.N. earlier this summer predicted it would take a year to clear some 420,000 metric tons of rubble left over from the three-week blitz, but Gazans deprived of concrete are recycling it as building material.