Papua New Guinea tsunami warning lifted

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Two strong earthquakes have struck off the South Pacific island nation of Papua New Guinea, but there were no immediate reports of casualty or damage and a tsunami warning has been lifted.

The first quake, a magnitude 6.9, struck around 11pm local time 525km northeast of the capital, Port Morseby. It struck 57km beneath the ocean floor, according to the US Geological Survey.

The second, a magnitude 7.3, struck a half-hour later in the same area, at a depth of 50km.

Indonesia issued a tsunami warning but lifted it soon after. The Pacific Tsunami Warning Centre did not issue an alert.

The archipelago nation is part of the Pacific Ocean's ring of fire, where earthquakes of this magnitude are relatively common.

- AP