The United States Geological Survey said the tremor was 6.7 magnitude, less than the 7.9 quake that struck the region on Saturday killing at least 1,900 people.
"Another one, we have an aftershock right now, oh shit," Indian mountaineer Arjun Vajpai said by telephone from advanced base camp on Mount Makalu, 20 km (12 miles) from Everest.
Screams and the sound of an avalanche could be heard over the phone line Vajpai was speaking on. At Everest base camp, Romanian climber Alex Gavan tweeted that the aftershock had set off three avalanches.

At least 55 people have been killed in northern and eastern India as a powerful earthquake originating in Nepal damaged houses and buildings and sparked panic among the people.

More than 100 people have also been injured in these states.
Five teams of National Disaster Response Force, comprising 45 personnel each, have been dispatched to Bihar and Uttar Pradesh for conducting rescue and relief operations.
NDRF teams are equipped with life-saving kits, breathing equipment, wood and metal cutters and other essential gadgets and are also accompanied by paramedics and sniffer dogs.
Bihar government had requested for the NDRF teams and one team each has been sent to Darbhanga, Supaul, Motihari and Gopalganj districts of the state. An NDRF team has also been sent to Gorakhpur in Uttar Pradesh, he added.
The National Crisis Management Committee, headed by Cabinet Secretary Ajit Seth, has already held a meeting and reviewed the situation. It will meet again soon to take stock of the situation.
NDRF Director General OP Singh said that 10 rescue teams have been flown to Nepal to assist the local authorities there.
Director General of India Meteorological Department, Laxman Singh Rathore, said that 14 aftershocks above the intensity of 5 on the Richter scale were registered in the affected areas.
Goyal said an inter-governmental coordination cell has been set up under the Cabinet secretariat, which will work with all the stakeholders engaged in rescue and relief operations in Nepal and India.
The Home Secretary said communication networks in the affected states were functioning fine.
The National Disaster Management Authority has set up a control room in the wake of the quake with the telephone numbers -- 011-26701728, 011-26701729, Mobile: +91 9868881801.

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