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

The biggest of the quakes, with a magnitude of 7.4, hit about 20 kilometres (12 miles) off Manay town in the Mindanao region just before 10 am (0100 GMT), 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 tunnelling for gold were killed when a shaft collapsed in the mountains west of Manay during the larger quake, rescue official Kent Simeon of Pantukan t

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