Manila: A strong earthquake measuring 6.8 has struck off the coast of the island of Mindanao in the Philippines and the Pacific Tsunami Warning Centre says there is a risk of large waves as far away as Indonesia.

The Philippines Institute of volcanology and seismology said the earthquake was about 57km southwest of Sarangani on Saturday.

Print-outs of two tsunami bulletins put out by the Pacific Tsunami Warning Centre. Credit:AFP

It was felt in most parts of Mindanao, the biggest island in the south of the archipelago nation.

There were no initial reports of damage or casualties.