(CNN) Rescuers are combing through the rubble for survivors after an earthquake Wednesday morning in Indonesia's Aceh province.
At least 100 people were killed, including young children, and 136 seriously injured, according to Indonesia's Disaster Management and Mitigation Agency.
The shallow 6.5-magnitude quake damaged homes, shops and mosques in the district of Pidie Jaya, completely destroying hundreds of structures.
Additional medical personnel have gone to the region after the Pidie Jaya hospital was damaged in the quake, which struck as residents were preparing for early morning prayers.
'We have to move so fast to save them'
Speaking in Jakarta, National Board for Disaster Management spokesman Sutopo Purwo Nugroho said the death toll could still rise.
"Now our priority is the search and rescue operation. We have to move so fast to save them," Sutopo said.
Rescuers recover a body from the rubble of a collapsed building in Pidie Jaya.
Indonesian President Joko Widodo ordered immediate assistance to be sent to Aceh in the wake of the earthquake.
In a statement, the International Organization for Migration said it had deployed two staff members to help coordinate assistance.
Quake rocks Indonesia's Aceh province
Members of Indonesia's search and rescue team continue to dig through rubble looking for earthquake survivors in Pidie Jaya, Aceh province, on Thursday, December 8. More than 100 people are confirmed dead after a 6.5-magnitude quake struck Wednesday, leveling buildings in the region.
An overview of Pidie Jaya shows continuing rescue efforts on December 8.
Quake survivors take refuge at a temporary shelter in Ulim, Aceh province, on December 8.
A woman stands amid the rubble of a market that was destroyed in the quake in Meureudu, on December 8.
A man inspects a collapsed building in Pidie Jaya, Aceh province, on Indonesia's Sumatra island, Wednesday, December 7.
Rescuers work to recover the body of an earthquake victim from a collapsed building. The death toll is expected to rise as rescuers retrieve more victims from under the rubble.
A distraught woman makes a phone call outside a hospital in Pidie Jaya.
A survivor's hand reaches out from under a collapsed building while rescuers work to free the person.
Rescuers carry the body of an earthquake victim in Pidie Jaya.
A man rides past a hospital that was heavily damaged by the quake in Pidie Jaya.
A family reacts to the death of a relative who was killed in the earthquake.
Rescuers, along with members of the Indonesian army, search debris for survivors in Lueng Putu town, Aceh province.
Men inspect a mosque that collapsed during the quake, which struck just as people were preparing for morning prayers on December 7.
Rescuers recover a body from the rubble of a collapsed building in Pidie Jaya.
A boy takes shelter from the sun amid the rubble in Pidie Jaya.
A crack caused by the earthquake is seen along a road in Sigli, Aceh province.
Medical personnel and family members transport a woman who was injured in the earthquake.
Emergency responders search through destroyed structures for survivors.
Indonesian Red Cross volunteers cover the bodies of victims at a hospital morgue. Additional medical workers had to be flown in after a local hospital was damaged in the quake.
Rescuers use heavy machinery to search for potential survivors under the rubble of a collapsed building in Pidie Jaya.
Two women are reflected in the mirror of a motorbike parked near a damaged building in Pidie Jaya.
"They'll be our eyes and ears on the ground and be able to give us a much clearer picture of what the (needs) are," Peter Kern, the organization's disaster preparedness project manager.
Oxfam Australia's Humanitarian Manager Meg Quartermaine said in a statement Wednesday that bad weather conditions and nightfall had affected ongoing search and rescue missions. Oxfam's local partners in Aceh are, however, continuing to carry out emergency assessments and distribute essential items.
"We will be distributing hygiene kits and tarpaulins, and have emergency response experts on stand-by to travel to the worst-affected ares if needed," said Quartermaine.
No tsunami warning issued
No tsunami warnings or advisories were issued. The quake's epicenter was 12 miles (19 kilometers) southeast of the town of Sigli in Aceh province.
Despite the lack of a tsunami warning, Sutopo said some residents fled to safety in the hills after the quake. "They are still traumatized by the last big earthquake and tsunami in 2004," he said.
The 2004 disaster killed more than 80,000 people after a tsunami swept across the Indonesian region, leaving millions homeless.
Rescue workers pull victims from destroyed buildings Wednesday in the town of Sigli.
Large earthquakes are relatively common in Indonesia, which sits on the infamous Ring of Fire, a set of fault lines that circle the Pacific Basin.
Wednesday's earthquake is Indonesia's second major temblor this year and the most severe yet.
Women stand next to relatives who were killed in Wednesday's earthquake.
In March, a magnitude-7.8 quake struck off the southwestern coast of Sumatra, but despite initial warnings, no tsunamis or deaths were registered as a result.
Journalist Jamaluddin Masrur in Jakarta contributed to this report.