Ugyen Tenzing, the country's director of disaster management, said rescuers were searching for survivors under the debris of collapsed buildings in the eastern districts of Munggar and Trashigang on Monday.
A 6.1-magnitude earthquake has killed at least ten people in the Himalayan kingdom of Bhutan, officials have said.
"It's hard to determine the extent of the damage at the moment. There is still information coming in," Tenzing said.
The state-run Bhutan Broadcasting Service reported that dozens had been injured.
Lungthen Dorji, the governor of Trashigang district said: "Houses, and monasteries and roads have been damaged. Mobile services are clogged."
Epicentre
According to the US Geological Survey, the epicentre was located just inside Bhutan's border with India, 180km east of Thimpu, the capital.
Strong tremors lasting up to 20 seconds were also felt in Guwahati, the capital of India's northeastern state of Assam. Cracks appeared in several buildings in the city but there was no serious damage, witnesses said.
The quake was also felt in Bangladesh and Lhasa, the Tibetan capital, but there were no reports of damage in either place.
Much of Bhutan, located in the mountains between China and India, is sparsely populated, reachable only by walking paths and without electricity or telephones.
Most of the 600,000 population live by subsistence farming, animal husbandry and forestry.
Local officials have said that an earthquake, measuring 6.1 on the Richter scale, has struck Bhutan, killing at least ten people and damaging many buildings.  The US Geological Survey said that the epicentre of the tremor was located along the country's southern border with India, 180 kilometres (110 miles) east of Bhutan's capital Thimphu.

Bhutanese director of disaster management Ugyen Tenzing said that rescue teams were searching the rubble of collapsed buildings for survivors. Tenzing said that "it's hard to determine the extent of the damage at the moment. There is still information coming in."

"We are anticipating that most of the houses are now down, destroyed," said Bhutan Home Minister Minjur Dorji. He also added that "these are not like you see in the metropolitan cities, like concrete houses. These are made of wood, mud and stone, generally two-storied houses."

The local governor, Lungthen Dorji, said, "houses, and monasteries and roads have been damaged. Mobile services are clogged."