MEUREUDU, Indonesia — Humanitarian organizations descended on Indonesia’s Aceh province Thursday as the local disaster agency called for urgent food supplies and officials raced to assess the full extent of damage from an earthquake that killed at least 100 people.

Volunteers and nearly 1,500 rescue personnel concentrated their search on the hard-hit town of Meureudu in Pidie Jaya district near the epicenter of the magnitude 6.5 quake that hit before dawn Wednesday. But the small number of heavy excavators on the scene meant progress was slow. Humanitarian assessment teams fanned out to other areas of the district.

National Disaster Mitigation Agency spokesman Sutopo Purwo Nugroho said the death toll had risen to 102 and warned it could increase. Search teams were using devices that detect mobile phone signals within a 100-meter radius to help guide their efforts as they scoured the rubble. The disaster agency said more than 750 people were injured.

Those killed included very young children and the elderly. Mohammad Jafar, 60, said his daughter, granddaughter, and grandson died in the quake but he was resigned to it as ‘‘God’s will.’’

He was getting ready for morning prayers when the earthquake hit. He said he and his wife managed to push their way out through the debris. Another man said he found his 9-year-old daughter alive beneath a broken wall at his neighbor’s house.

Thousands of people are homeless or afraid to return to their houses. Nugroho said 11,000 people have been displaced and are staying at shelters and mosques or with relatives. About 10,500 homes were damaged and dozens of mosques and shops collapsed.

Killer quakes occur regularly in the region, where many live with the terrifying memory of a giant 2004 quake that triggered a tsunami that killed more than 100,000 people.

Associated Press