Authorities said that aftershocks rocked the northern Philippines early Wednesday, hours after a strong earthquake injurėd at least six people and damaged a hospital and several old churches.

The 6.4-magnitude earthquake struck the mountain town of Dolores in Abra province late Tuesday and was followed by numerous aftershocks throughout the night, according to the state seismology office.

“We hid under a table and my family only went out of the house after the shaking stopped,” Abra rescuer Ron Sequerra told AFP by phone that strong ground shaking had woken his family up.

Sequerra added that six people were injurėd in the Abra town of Lagayan.

According to photos posted on the town’s official Facebook page, the mayor’s office and a high school building in Lagayan were sealed off after cracks and broken glass windows were discovered.

Several patients spent the majority of the night outside a government hospital in Batac, Ilocos Norte, after the ceiling collapsed on several rooms and damaged equipment, according to hospital staff.

Boulders rolling down a hillside temporarily shut down a road connecting Batac to the nearby town of Banna, but rescue officials said the landslide had been cleared.

According to the civil defense office, a number of old churches in Abra and Ilocos Norte were also damaged.

Ilocos Norte Governor Matthew Manotoc declared a school holiday and directed government employees not to report to work while officials inspected the structural integrity of buildings.

According to the official count, a 7.0-magnitude earthquake that struck the mountainous Abra province in July caused landslides and ground fissures that resulted in 11 fatalities and hundreds of injuries.

The Philippines, which is located along the Pacific “Ring of Fire,” a region of intense seismic and volcanic activity that stretches from Japan through Southeast Asia and across the Pacific basin, experiences earthquakes on a daily basis.