An offshore earthquake with a magnitude of 6.8 rocked Davao Occidental in the southern Philippines on Friday afternoon, the Philippine Institute of Volcanology and Seismology said.

The quake was initially registered at magnitude-7.2 before the institute revised the data. The quake, which occurred at 4:14 p.m. local time (GMT 0814), hit at a depth of 72 kilometers, about 34 kilometers northwest of Sarangani town.

A man and his wife were killed when a concrete wall collapses near General Santos City, city police said.

(With input from agencies)