NEW DELHI — At least 27 children, some as young as 4 years old, were killed Monday when their school bus skidded off a mountain road into a gorge in the foothills of the Himalayas, officials said.

Three adults were also killed in the crash, Himachal Pradesh state transport minister Govind Singh Takur told the Press Trust of India news agency. At least a dozen people were taken to area hospitals.

Initial reports indicated that the bus driver was speeding as he took the children home and lost control at the edge of the gorge, with the bus crashing some 200 feet below, said police officer Sunil Kumar.

News reports said most of the children riding in the bus were in elementary school. The accident occurred in the Kangra Valley, about 300 miles north of New Delhi.

India’s roads have long been feared for their deep potholes, reckless drivers and, very often, a lack of guardrails. Fatal accidents are common.

‘‘I am deeply anguished by the loss of lives,’’ Prime Minister Narendra Modi said in a tweet.

ASSOCIATED PRESS