Four people, including a woman, were killed and 28 injured when their bus skidded off a road in Meghalaya's West Garo Hills district, police said Friday.

The accident took place late Thursday at Dollonggre area on the National Highway 51, about 300 km from state capital Shillong.

"Four people died on the spot," Mukesh Kumar Singh, the district police chief of West Garo Khasi Hills, told IANS.

"Out of the 28 injured passengers, four are in a critical condition...," Singh added.

He said an investigation was on to ascertain the cause of the accident.

The bus was ferrying passengers to Shillong from Tura, he said.