MANILA (UPDATE) - A magnitude-6.4 earthquake struck Maguindanao early Sunday, Phivolcs said.
The tremor was upgraded from an initial measurement of magnitude 6.1.
It struck 13 kilometers southeast of Cotabato City at 1:08 a.m., state seismologists said.
The earthquake, which was tectonic in origin, was not almost felt due to its depth of 543 kilometers, according to Phivolcs.
No damage was reported in Cotabato City but the public is advised to be alert for possible aftershocks, the local disaster risk reduction office said.
Instrumental intensities were reported in the following areas:
- Intensity II -- Alabel and Malungon, Sarangani;
- Intensity I -- Tupi, General Santos City and Koronadal City, South Cotabato; Kiamba, Sarangani.
--With a report from Lore Mae Andong, ABS-CBN News