A powerful 7.1 magnitude earthquake struck the Philippines on the island of Luzon on Wednesday, damaging buildings and triggering landslides.
Tremors as far away as the capital Manila, where high-rise buildings were evacuated.
At least one person was reported killed and several others injured. Electricity has been automatically cut off in some affected areas as a safety precaution.
"This is a major earthquake. We expect strong aftershocks," said Renato Solidum, director of the state seismology agency, who added that the "the focus of attention is on Abra and nearby provinces."
Epicenter in Abra province
The epicenter was near the town of Lagangilang in Abra province. The province is home to 250,000 people and surrounded by rugged mountains.
"We are feeling aftershocks every 15 minutes," Abra provincial vice governor Joy Bernos told a local television news program.
A hospital in Abra partially collapsed following the quake, but officials said no casualties had been reported.
"We are still experiencing aftershocks," Rovelyn Villamor, the mayor of Lagangilang near the quake epicenter in Abra province, told the DZRH radio station.
"We have received reports of damages to houses. But so far no casualties."
The office of President Bongbong Marcos said it has dispatched rescue and relief teams to the area.
Buildings evacuated further afield
Eric Singson, a congressman from the nearby Ilocos Sur province, told the DZMM radio station that the quake had been felt strongly there, too.
"The earthquake lasted 30 seconds or more. I thought my house would fall," he said.
"Now, we are trying to reach people.... Right now there are aftershocks so we are outside our home."
Meanwhile, in Manila, the city's metro rail systems were halted and major buildings including the Senate were evacuated.
The Philippines lies along the Pacific "Ring of Fire," an arc of faults across the Pacific Ocean where most of the world's quakes occur.
