Guwahati/Thimpu, Sep 21 - A high magnitude earthquake measuring 6.3 on the Richter scale Monday killed at least seven people in the Himalayan kingdom of Bhutan and wounded three others, while reports indicated damages to buildings in India's northeastern states of Assam and Sikkim due to the tremor.

A Bhutan government official confirmed seven deaths in the eastern part of the Himalayan nation.

'Five people were killed in Mongar and two deaths were reported from Trashigang in eastern Bhutan. We are trying to get more information from the affected places with initial reports saying three more people were injured,' said U. Tenzing, the director of Bhutan's disaster management department.

The casualties were reported when their houses collapsed or some of them were hit by flying debris.

'Most of the mud and stone houses with tin roofs caved in with several schools, monasteries and houses damaged in the earthquake,' another senior Bhutanese police official said, requesting not to be named.

Police and civil rescue teams have since fanned out to the tremor hit eastern districts of Mongar and Trashigang to look for people who could be trapped or injured.

'There was extensive damage to monasteries, schools, houses and other structures in eastern Bhutan,' a newspaper report added.

The tremors were also felt in parts of Assam, other north-eastern states of India and West Bengal at 2.