A 6.7 magnitude earthquake struck the country's remote northeast region before daybreak on Monday injuring 100 people, killing at least six people and causing damage to several buildings.

Tremors were also felt across the belt, including in the adjoining regions of Myanmar, Bangladesh and Tibet.

There were reports of damage to several buildings in Imphal, the capital of Manipur. The tremor caused large cracks in several walls and a portion of one building buckled, police said.

Three persons were killed in the collapse. The Manipur administration started rescue operations in the area with the help of the Indian Army and paramilitary forces. In West Bengal, a few people sustained injuries and three were taken to hospital in the North Bengal town of Siliguri.

Tremors were felt at 4:35 am, but there was no widespread alarm as most were deep asleep.

Across the border in Bangladesh, one man allegedly died of a heart attack after the earthquake. According to the meteorological department, the epicentre of the quake was in Tamenglong region of Manipur. It hit at a depth of 17km in the India-Myanmar border region. The US Geographical Survey (USGC) said the epicenter was 29 kilometeres west-northwest from Imphal.

People were frightened and rushed out of their homes in Guwahati, the capital of neighbouring state of Assam, as they felt substantial tremors at least twice within 60 seconds. While Guwahati felt tremors, several buildings in Silchar were damaged. The tremors were also experienced in Odisha, Jharkhand and Bihar.

China's state news agency Xinhua reported tremors being experienced in southeast Tibet and with the prefectures of Nyingchi, Shannan and Qamdo and Lhasa experiencing "strong tremors."