MUZAFFARABAD, Pakistan (AP) – Hungry survivors of Pakistan’s worst earthquake could not wait for relief trucks to unload crates of food and water Tuesday in this pancaked city in the Kashmiri mountains. Instead, they mobbed the vehicles, shoving each other and grabbing what they could.

“We need food! We need food!” one desperate man shouted.

About 10 trucks brought by Pakistani charities and volunteers rumbled into this city as the first aid packages reached some of the millions left homeless by Saturday’s magnitude-7.6 earthquake, the nation’s worst ever.

But heavy rain and hail later grounded relief helicopters and stopped trucks, imposing more misery on the survivors as the United Nations warned of potentially lethal outbreaks of measles, cholera and diarrhea.

Officials said the quake death toll had surpassed 35,000, with many bodies still buried beneath piles of concrete, steel and wood. Whole communities were flattened in the region touching Pakistan, India and Afghanistan.

Three days after the quake, survivors still were being pulled from the rubble of pancaked schools and houses by British, German, French and Chinese rescue teams. A Red Cross official said people could survive under the rubble for as long as a week.

A 75-year-old woman and her 57-year-old daughter were rescued after 80 hours in the ruins of an Islamabad apartment tower, and a teenage boy was freed in the northern town of Balakot.

“He’s alive!” rescuers shouted with joy as people gave the boy food and water and kissed him on the head. The air smelled of decomposing corpses.

The U.N. World Food Program began a major airlift of emergency supplies, including high-energy bars to feed 240,000 people.

NATO agreed to coordinate an airlift of aid supplies from Europe. Eight U.S. military helicopters based in neighboring Afghanistan shuttled 16 tons of food, water, medical supplies and blankets to quake-hit zones, the military said.

Chinook and Black Hawk choppers flew 102 relief workers and others into the region and evacuated 126 people, said Lt. Col. Jerry O’Hara, spokesman for the U.S. base at Bagram, Afghanistan.

In Washington, a Pentagon spokesman said at least two dozen more military helicopters would be in Pakistan within days. The Islamabad government also requested earthmovers, forklifts, bulldozers and trucks, spokesman Larry Di Rita said.

The United Nations appealed for $272 million in donations, saying 2 million people were homeless. The United States pledged $50 million, Japan $20 million, Canada $17 million and Britain $3.5 million. Other nations donated more helicopters, money and supplies, including tents, blankets, medical aid and food kits.

“We as a nation are going through a challenging time,” Pakistan Prime Minister Shaukat Aziz said. “We are overwhelmed by the support we are getting both within the country and outside the country and are thankful to those countries, friends and individuals who have made our task easier.”

Tuesday’s efforts were hampered by torrential rains and hail, and crates of supplies sat on tarmacs waiting for delivery. At least one U.S. helicopter turned around because of storms in the mountain passes, the military said.

“The recovery efforts have been slowed by bad weather and large parts of the region are still inaccessible because landslides have destroyed the road network,” a U.N. statement said.

Bob McKerrow, coordinator of relief efforts for the International Federation of the Red Cross, said in Islamabad that 17 trucks left for affected areas with supplies, including blood.

“Some of the roads are just being reopened and this rain is not going to help at all,” McKerrow said. “And the possibility of further landslides blocking roads is a threat every minute of the day.”

The Pakistani government’s official death toll was about 23,000, but a senior army official involved in rescue operations said the death toll was estimated to be between 35,000 and 40,000 people. Tens of thousands were injured.

The official spoke on condition of anonymity because he was not authorized to speak to the media about the toll. The estimate matched that of local officials.

Neighboring India said 1,300 people died in its part of Kashmir, the disputed province at the center of two wars between New Delhi and Islamabad.

India planned to send a planeload of food, tents and medicine to its longtime rival in what was seen as a boost to the peace process between the nuclear-armed neighbors. Islamabad, however, refused India’s offer of helicopters.

One of the places hardest-hit by the quake was Muzaffarabad, the capital of Pakistani-controlled Kashmir, where most homes and all government buildings were destroyed. Bodies were still in the streets.

The city had no electricity or running water and many of its 600,000 people had no shelter with winter just six weeks away. Night temperatures have dropped to the low 60s and people were huddling under wrecked trucks and plastic sheets.

Villagers came down from the hillsides carrying injured children, hoping to get them on helicopter flights to Islamabad. The World Health Organization said field hospitals were being set up.

Turkish doctors, medics from the group Doctors without Borders and assessment teams from other international agencies were working in the city. But the effort seemed nowhere near to meeting the overwhelming need.

Attempts to distribute aid turned chaotic as survivors scuffled for handouts of cooking oil, sugar, rice, blankets and tents.

Police looked on helplessly as more than 200 people raided a stock of food arranged at a soccer field near the city center – one of six designated aid distribution points. One man took a big sack of sugar while another left on a motorized rickshaw with a crate of drinking water.

“I can’t wait for the food to be distributed properly,” said Ali Khan, a construction worker who had barely eaten for days. “I need it desperately and I’ll take it.”

Others desperate to drive the injured to hospitals looted gas from a hole in the ground, using an improvised pully system of plastic bottles.

Religious opposition leaders said the Pakistani army and government were failing to coordinate with civilian relief efforts. Qazi Hussein Ahmed said the army should withdraw troops from Waziristan, where it is fighting al-Qaida-linked groups.

The quake damaged sanitation systems, destroyed hospitals and left people with no access to clean drinking water, making them more vulnerable to disease.

“Measles could potentially become a serious problem,” WHO spokeswoman Fadela Chaib said in Geneva. “We fear that if people huddle closely together in temporary shelters and crowded conditions, more measles cases could occur.”

Measles – potentially deadly for children – already are endemic in the region and only 60 percent of children are protected. At least 90 percent coverage is needed to prevent an epidemic, WHO said. The agency will soon begin a mass immunization program.

Rescue teams used high-tech cameras and lifting gear to search for survivors under debris. They also just yelled into the rubble.

“Hello! Rescue team here! Can you hear us?” one German rescuer shouted in Muzaffarabad. There was no answer.

At the collapsed 10-story Margalla Towers in Islamabad, teams pulled 57-year-old Khalida Begum and her mother, Mahbibi, to safety after 80 hours. At least two dozen people died there.

“Thanks to god, my family is safe,” Khalida Begum said. “As far as I know, all my family is safe now, thank god. I’m so happy.”

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