Davao, Philippines — A powerful earthquake shook the southern Philippines on Tuesday, triggering landslides and loosening boulders that killed six people and injured more than 100 others in a region already damaged by a strong tremblor two weeks earlier, officials said.

The magnitude 6.6 quake was caused by the movement of a fault about 4.3 miles deep about 16 miles east of Tulunan in Cotabato province, the Philippine Institute of Seismology and Volcanology said.

Tulunan Mayor Reuel Limbungan said about 90% of the houses in three rural villages were damaged by the intense ground movement.

A woman on a stretcher is assisted by a companion after a powerful earthquake was felt in Davao City, Philippines Tuesday, October 29, 2019. AP

Davao city, the hometown of President Rodrigo Duterte, also shook from the quake, the Reuters news agency reports.

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"Inspection is ongoing and the disaster risk office is checking our roads and bridges," Mayor Sara Duterte, his daughter, told the ANC news channel, according to Reuters.

Rodrigo Duterte was Davao city mayor for many years, Reuters says.

Among the dead were a father and his child who were hit by boulders that rolled down a mountain onto their small farm in hard-hit North Cotabato province. Another child was injured, provincial disaster response officer Mercedita Foronda said. She said more than 100 villagers were hurt in the province. Most of the injuries were minor.

A damaged local town hall is seen in Mabini, Davao Del Sur, Philippines after a magnitude 6.6 earthquake struck October 29, 2019, in this picture obtained from social media. Reuters

Two others died in a landslide and falling debris in Magsaysay town in Davao del Sur province. A pregnant woman was killed by a falling tree in Tulunan and a 66-year-old man died from head injuries after apparently being hit by heavy debris in South Cotabato province's capital, Koronadal, where 30 other people were injured as they dashed out of their homes, offices and shopping malls, police and other officials said.

Several cities and towns suspended classes to allow inspections of school buildings. Several buildings damaged in another quake earlier this month sustained further damage and were closed to the public.

A magnitude 6.3 earthquake on Oct. 16 left at least seven people dead and more than 200 others injured and destroyed or damaged more than 7,000 buildings, officials said.

In July, two earthquakes hours apart struck a group of sparsely populated islands in the Luzon Strait in the northern Philippines, killing eight people.

The Philippines lies in the Pacific "Ring of Fire," an arc of faults around the Pacific Ocean where most of the world's earthquakes occur.

A magnitude 7.7 quake killed nearly 2,000 people in the northern Philippines in 1990.