MUZAFFARABAD, Pakistan - An aftershock jolted parts of Pakistan today, panicking hungry, homeless survivors of last weekend's devastating earthquake and forcing rescuers to suspend efforts to save a trapped woman, who died overnight.

The 5.6-magnitude aftershock was centered 85 miles north of Islamabad, near the epicenter of Saturday's 7.6-magnitude quake that demolished whole towns, mostly in the Himalayan region of Kashmir. The quake today shook buildings, but there was no significant damage in an already demolished region.

There have been dozens of aftershocks since the main quake, including a 6.2-magnitude temblor.

"They will go on for months, possibly years," said Don Blakeman, a geophysicist at the U.S. Geological Survey's National Earthquake Information Center.

Trucks and helicopters with aid from dozens of countries choked the roads up to the crumbling towns of Kashmir, but the hungry and the homeless in many hard-hit areas were still in desperate straits five days after the temblor struck.

The death toll was believed to be more than 35,000, and tens of thousands were injured.

Eight U.S. helicopters flew 53 sorties to the affected region on Wednesday, transporting more than 1,000 people - rescue workers in, and injured Pakistanis out, said Lt. Col. Jerry O'Hara, spokesman for the U.S. base at Bagram, Afghanistan, where the helicopters are based. They also brought in 123,000 pounds of supplies and equipment, he said.