Residents in northern Afghanistan used shovels, picks and their bare hands to search for survivors in the rubble of the second major earthquake to strike the area in less than three weeks.
The officials say rescuers Saturday, are trying to reach people trapped beneath collapsed buildings. They add that there are still small villages that have yet to report in.
Friday's tremor measured 5.8 on the Richter scale and was centered in the Hindu Kush mountains - an area prone to earthquakes. Afghan officials say it killed at least 50 people and injured at least 150 others. The quake also completely destroyed villages that had been damaged by a more intense tremor in the same region March 25. The earlier earthquake killed as many as 1,000 people.
U.N. aid workers say they were already in place in the area because of last month's quake, and so have been able to move quickly to provide relief and emergency supplies.