(Associated Press photo)
The quake, with a preliminary magnitude of 6.9, struck at 6:10 p.m. local time and was felt across northern and eastern India, including in the capital of New Delhi. It triggered at least two aftershocks of magnitude 6.1 and 5.3, Indian seismology official R.S. Dattatreyan said. He warned more aftershocks were possible.
At least five people in India's Sikkim state were killed and more than 50 were injured, according to the state's top official, Chief Secretary Karma Gyatso. The north Indian state of West Bengal reported four deaths, and Bihar state reported two. Nepal's government said five people died and dozens were hurt there, including two men and a child who were killed when a brick wall toppled outside the British Embassy in Nepal's capital, Katmandu.
The full extent of damage was not immediately known because the region is sparsely populated with many people living in remote areas now cut off by mudslides triggered by the quake, state police chief Jasbir Singh said.
TV stations reported buildings buckled, sidewalks cracked and two major roads collapsed in Sikkim's state capital of Gangtok, 42 miles southeast of the quake's epicenter near the border with Nepal. The Indo-Tibetan Border Police said two of its buildings had collapsed in Gangtok.
Small army columns fanned out across the city of some 50,000 overnight to search for anyone pinned under fallen debris.
"We have sounded a high alert. Police are on the streets in Gangtok and other major towns," he said.
Electricity and some phone service was interrupted in the area.
Power lines snapped in the West Bengal cities of Darjeeling and Kalimpong, which "are now in total darkness," state Chief Minister Mamata Banerjee said, according to Press Trust of India.
Prime Minister Manmohan Singh offered to send troops to help, and summoned the National Disaster Management Authority for an emergency meeting.
The air force sent five planes to help with rescue efforts.
The region has been hit by major earthquakes in the past, including in 1950 and 1897.
In neighboring Nepal and Bangladesh, the quake Sunday night sent residents rushing out of their homes, offices and shopping centers.
In Katmandu, members of parliament who were debating the national budget ran out of the assembly hall into a parking area.
They returned 15 minutes later and resumed their session.
The quake was also felt as far as the Indian capital, with New Delhi residents also rushing out of shaking buildings.