Two powerful quakes struck off the southern Philippines on Friday, killing at least six people and triggering tsunami warnings that were later lifted.

The biggest of the quakes, with a magnitude of 7.4 , hit about 12 miles off Manay town in the Mindanao region just before 10 a.m., according to the United States Geological Survey.

An aftershock with a magnitude of 6.7 rocked the same area almost 10 hours later, one of scores that followed the morning quake.

Both came 11 days after a magnitude 6.9 earthquake killed 75 people and injured more than 1,200 in Cebu province in the central Philippines, according to official data.

Three miners tunneling for gold were killed when a shaft collapsed in the mountains west of Manay during the larger quake, rescue official Kent Simeon of Pantuk

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