(Adds depth of quake)

WASHINGTON, July 24 (Reuters) - A 6.5 magnitude earthquake struck the Philippines on Saturday, 83 miles (134 km) south southwest of Cotabato, Mindanao, the U.S. Geological Survey reported.

It initially put the quake’s strength at 6.7 and then revised it downward to 6.5. The depth was 350 miles (563 km).

The Pacific Tsunami Warning Center said a destructive tsunami was not generated, “based on earthquake and historical tsunami data.” (Reporting by Alan Elsner)