Thousands huddled in makeshift camps or slept in the street after Saturday's quakes for fear of more aftershocks, 60 of which had already struck. A lack of tents and other supplies left them exposed to the night chill, one witness told Reuters.

"I saw some people whose entire home was destroyed, and all their livestock killed," Tahir Sadati, a local photographer, said by telephone. "People need help, they need warm clothes, more tents, blankets and bread."

The worst damage and most casualties appeared to have been in rural villages around the towns of Ahar, Varzaghan and Harees, near the major city of Tabriz, Iranian media reported.

But Iranian officials said rescue operations had ended by Sunday afternoon and that all those trapped beneath the rubble had been freed, Iran's English-language Press TV reported.

Many villages are hard to reach by road, hindering rescue efforts. Hospitals in Tabriz, Ardabil and other cities nearby took in many of the injured, residents and Iranian media said, and there were long queues of survivors waiting to be treated.

The second, measuring 6.3, struck 11 minutes later near Varzaghan, 49 km (30 miles) northeast of Tabriz.

More than 1,000 villages in the area were affected by the earthquakes, Ahmad Reza Shaji'i, a Red Crescent official, told the Iranian Students' News Agency (ISNA). Some 130 villages suffered more than 70 percent damage, and 20 villages were completely destroyed, he said.

Close to 300 people were believed to be dead, said Reza Sadighi, Ahar's local governor, Fars news agency said. National emergency head Gholam Reza Masoumi said 5,000 people are believed to be injured, according to ISNA.

About 36,000 people in the quake-hit area have been given emergency shelter, Masoumi was quoted as saying by ISNA.

Iranian lawmaker Mohammad Hassan-Nejad warned that if relief efforts did not speed up, the death toll would swiftly rise.

Nearly 100 ambulances and 1,100 Red Crescent workers were deployed, Shaji'i said, along with 44,000 food packages and 5,600 tents for shelter. The relief agency had enough supplies and most residents in the area had access to clean water but Shaji'i asked residents to donate cash to the relief effort.