A powerful magnitude-7.4 earthquake struck off the southern Philippines on Friday, killing at least six people and triggering regional tsunami warnings that were later lifted.

The quake hit about 20 kilometres (12 miles) off Manay town in the Mindanao region at 9:43 am (0143 GMT), according to the United States Geological Survey.

It came just 11 days after a magnitude-6.9 earthquake killed 75 people and injured more than 1,200 in Cebu province, according to official data.

Three miners tunnelling for gold were killed when their shaft collapsed in the mountains west of Manay, rescue official Kent Simeon of Pantukan town told AFP. One miner was pulled out alive and several others were injured, he said.

"Some tunnels collapsed, but the miners managed to get out. In that particular area, on

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