A bus has caught fire after hitting a truck on a highway in western India, killing at least 12 passengers, an official said.

Another 43 people with serious burns were taken to a hospital in Nashik, a city in Maharashtra state, said police officer Bhagwan Adke.

Most passengers were sleeping when the collision happened at around 5am on Saturday and the vehicle was completely burned, the Press Trust of India news agency said.

Some people living near the highway reached the spot but could not help as the raging fire engulfed the vehicle.

The rescue work started after the fire service and police doused the blaze, Mr Adke said.

Eknath Shinde, the top state elected official, said the cause of the fire is being investigated.

Prime Minister Narendra Modi said he was anguished by the bus tragedy. “May the injured recover at the earliest. The local administration is providing all possible assistance to those affected,” he tweeted.

Nashik is nearly 120 miles north east of Mumbai, the capital of Maharashtra.

Hundreds of thousands of people are killed or injured annually on India’s roads. Most accidents are blamed on reckless driving, poorly maintained roads and ageing vehicles.