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Six people have been killed and many more injured as another powerful earthquake hit Nepal, flattening buildings 30 miles away.

It comes less than three weeks after the impoverished country was devastated by a 7.8-magnitude earthquake, which killed at least 8,000 people and injured more than 17,800.

The US Geological Survey has upgraded the latest quake – which struck at lunchtime on Tuesday – from 7.1 to 7.3 magnitude.

It hit near the Everest base camp, and was measured at a shallow depth of about 12 miles (19 km).

The epicentre was around 40 miles west of Namche Bazar, a remote area near the China border.

It was followed by two aftershocks of magnitudes 6.3 and 5.6.

Four people died as several buildings, including a six-storey office block, collapsed in Chautara, Sindhupalchok, about 30 miles from the eipicentre.

Norway’s Red Cross, based at a 60-bed hospital in the town, said there were “many injured, several killed”.

Tino Kreutzer, who is in Chautara, said the quake lasted around 40 seconds as hundreds ran into the streets.

Chautara suffered the heaviest death toll in last month’s quake, which flattened buildings and left thousands homeless.

The airport has been closed more than 50 miles away in the capital Kathmandu.