MUZAFFARABAD, Pakistan - Rescuers searching for survivors in the rubble of Pakistan's worst earthquake scaled back operations today, while aid workers held mass burials and rushed to set up tent camps for an estimated 2 million homeless before the harsh winter.

With Pakistan's death toll estimated at more than 35,000, officials said there was virtually no hope of finding more people beneath tens of thousands of collapsed buildings. India has reported more than 1,350 deaths on the side of Kashmir it controls from the magnitude-7.6 quake on Oct. 8.

"We are all of the view that there is a less than 1 percent chance of survival on the seventh day," U.N. spokesman Winston Chang said.

Most of Pakistan's deaths were in the divided Himalayan region of Kashmir, where snow has already started to fall in some areas.

Jan Egeland, the U.N. undersecretary-general and emergency relief coordinator, said millions urgently need food, medicine, shelter and blankets.

"I fear we are losing the race against the clock in the small villages" cut off by blocked roads, Egeland said during a visit to the devastated city of Muzaffarabad, the capital of Pakistani Kashmir. "I've never seen such devastation before."

Many exhausted relief workers were dealing with the added burden of fasting during daytime hours for the Muslim holy month of Ramadan.

Maj. Farooq Nasir, an army spokesman in Muzaffarabad, said the search and rescue operation had ended. Army officials in Balakot, another of the hardest-hit towns in northwest Pakistan, said they were shifting the rubble of collapsed buildings and removing dead bodies.

But Abdul Akbar, a senior official at the Federal Relief Commission - a newly created body based in the capital Islamabad to oversee relief operations - said rescue operations were continuing alongside relief work.

Water and electricity were restored to parts of Muzaffarabad, a city of about 600,000. Authorities were also working to fix grid stations to bring power back to outlying villages.

The country's relief commissioner, Maj. Gen. Farooq Ahmad Khan, said Pakistan expected to get 2 million blankets and 100,000 large tents before the onset of winter. He said 200,000 houses had been destroyed.

From daybreak, Pakistani military helicopters and choppers from other countries flew in and out of a sports stadium in Muzaffarabad, where a temporary hospital had been set up. The choppers carried out injured people from remote villages and ferried aid workers to isolated regions.

The U.S. military has deployed 13 helicopters, including eight Chinooks, three Blackhawks and two heavy-lifting MH-53s, to ferry rescue workers and supplies to the quake zone, and has begun dropping relief supplies by air from C-130s. It also prepared to send a 36-bed Mobile Army Surgical Hospital, or MASH, from Germany, and a water purification crew.

U.S. aircraft and troops will assist in relief efforts in Pakistan as long as they are wanted, the commander of the U.S. military's disaster assistance center said today.