A powerful magnitude-7.4 earthquake struck off the southern Philippines on Friday, triggering warnings of a "destructive tsunami" on the country's Pacific coast within hours. The quake struck about 20 kilometres (12 miles away) from Manay in the Mindanao region at 9:43 am (0143 GMT), the United States Geological Survey (USGS) said. "Destructive tsunami is expected with life-threatening wave heights" on the archipelago nation's east coast, the Philippine Institute of Volcanology and Seismology reported. Coastal residents in these areas "are strongly advised to immediately evacuate to higher grounds or...