NEW DELHI (AP) - A bus carrying a wedding party plunged into a gorge in mountainous northern India, killing at least 18 people and injuring another 28, a news report said Tuesday.

The bus fell 180 metres after part of a highway where it was parked caved in on Monday night, the Press Trust of India news agency quoted superintendent of police V.P. Singh as saying.

The accident occurred as some of the passengers were clearing boulders blocking the highway after rains triggered mudslides in Rudraprayag district, 250 kilometres northeast of New Delhi, Singh said.

Thirteen people died on the spot and five others later succumbed to injuries. The 28 survivors were hospitalized, Singh said.

It wasn't clear whether the bride and groom were among the dead.

Overcrowding, reckless driving and ageing vehicles are blamed for many accidents on Indian roads.