A powerful earthquake in the southern Philippines has left at least 35 people dead and 144 injured. This was reported by Qazaqyia.kz citing The Guardian.

The magnitude-7.8 earthquake struck early Monday about 20km (12.4 miles) off the coast of Sarangani province, with tremors felt strongly across Mindanao and 420km away in the city of Manado on the Indonesian island of Sulawesi.

Authorities were verifying preliminary reports of 35 people killed and 144 injured across Mindanao, mostly from falling debris and landslides, according to civil defence officials. They told people not to enter damaged homes and other infrastructure because of the threat of aftershocks.

Video verified by the Guardian shows the collapse of the upper floor of a Jollibee restaurant, a popular fast food chain, as well as the outer concrete walls of a commercial complex giving way in General Santos City, near the epicentre of the quake.

In Davao del Sur, part of a high school collapsed as students gathered outside, a video shared by the local radio network Bombo Radyo showed.

Images of a convenience store in General Santos City showed its entrance destroyed, with smashed glass and overturned benches strewn across the street outside.

Power outages were reported and people were urged to go to higher ground. No further information on casualties was immediately available from the office of civil defence.

The quake's epicentre was 8 miles (13km) south-west of General Santos City, and its focus was 6.2 miles underground, according to the Philippine Institute of Volcanology and Seismology in its initial report. It struck at 7.37am local time. The US Geological Survey said the magnitude was 7.8 with a depth of 34 miles.

Tsunami warnings were cancelled after more than six hours in the southern Philippines, northern Indonesia and the Malaysian state of Sabah on Borneo island, where residents in coastal areas had been told to evacuate immediately to higher ground.

The president of the Philippines, Ferdinand Marcos Jr, said evacuation centres were ready and operational as government agencies continued to assess the damage and clear the routes needed for rescue operations. "The national government is moving and we will not leave Mindanao behind," he said in a statement.

Residents felt the earthquake tremors in Indonesia's North Sulawesi and North Maluku provinces.

The Philippines is one of the world's most disaster-prone countries and is often hit by earthquakes and volcanic eruptions because of its location on the Pacific "Ring of Fire", an arc of seismic faults around the ocean. The archipelago is also hit by about 20 typhoons and tropical storms a year.

The earthquake struck as public schools reopened for a new academic year. A video taken at Mahayhay elementary school in Davao showed panicked pupils scrambling for safety during the morning flag ceremony.

The Philippines Red Cross reported attending three high schools to support students traumatised by the quake.

Marcos Jr ordered the suspension of schools in affected areas until further notice. "The safety of our children comes first," he said.