MANILA, Philippines — A powerful earthquake with a preliminary magnitude of 7.6 struck Saturday off the coast of the southern Philippines island of Mindanao and Philippine authorities issued a tsunami warning.

The quake struck at 10:37 p.m. and was measured at a depth of 20 miles. There are no immediate reports of damage or casualties.

The Pacific Tsunami Warning Center said based on the magnitude and location it expected tsunami waves to hit the southern Philippines and parts of Indonesia, Palau and Malaysia.

The USGS gave a preliminary magnitude of 7.6 while the Philippine agency in charge of earthquakes said it measured 6.9.

Teresito Bacolcol of the Philippine Institute of Volcanology Seismology told The Associated Press his agency advised residents along the coast of southern Surigao del Sur and Davao Oriental provinces to evacuate immediately to higher grounds.

Based on the quake’s magnitude, he said a 3.2-foot tsunami may hit but the wave could be higher in coves and bays.

The Philippines experiences regular earthquakes and volcanic eruptions due to its location on the Pacific “Ring of Fire,” an arc of seismic faults around the ocean.

This is a developing story. Please check back for updates.