[Updated 10:06 a.m. ET] People in eastern areas of the Philippine island of Mindanao should evacuate to higher ground after a 7.6-magnitude earthquake triggered a tsunami warning, an official of the Philippine Institute of Volcanology and Seismology said, according to the Philippine News Agency.

"Residents living (in) these areas facing the Pacific Ocean are advised to evacuate to higher places," he said, citing the areas of Surigao del Sur and Davao Oriental as particularly vulnerable.

[Updated 9:52 a.m. ET] A tsunami warning has been lifted for Japan, Taiwan and several Pacific islands, but a warning remains for Indonesia and the Philippines, the National Oceanic and Atmospheric Administration's tsunami center said Friday.

[Updated 9:50 a.m. ET] The U.S. Geological Survey has revised the magnitude of an earthquake that struck off the coast of the Philippines to 7.6, down from an initial reporting of 7.9, the agency said Friday.

[Posted 9:01 a.m. ET] An earthquake with a magnitude of 7.9 has struck off the coast of the Philippines, the U.S. Geological Survey said Friday.

The quake prompted a tsunami warning for parts of Indonesia, the Philippines, Taiwan, Japan, Guam and other areas, the Pacific Tsunami Warning Center said.

"An earthquake of this size has the potential to generate a destructive tsunami that can strike coastlines near the epicenter within minutes and more distant coastlines within hours," the tsunami warning center said.

The quake, which was about 20 miles deep, struck just before 8:50 p.m., the agency said. Its center was about 65 miles southeast of the town of Guiuan, in the Philippine province of East Samar.

Ed Serrano, the head of security at the Marco Polo Hotel in the city of Davao, about 250 miles south of Guiuan, said he felt the ground shake.

"The quake was very strong and the hotel guests were panicking. Most of them went outside," he said. "But now the situation is under control and we are waiting for official reports on how strong the quake was."

There were no immediate reports of damage or injuries.