Baku, September 12, AZERTAC

At least 82 people have been killed in a powerful explosion that tore through a restaurant in Petlawad in the Indian state of Madhya Pradesh, officials say, according to the BBC News.

It was packed with workers and schoolchildren eating breakfast.

The exact cause of the blast is unclear. Police first said a cooking gas cylinder exploded, and later added that explosives being stored nearby may also have caught fire.

Rescue efforts are continuing and nearby buildings have been evacuated.

At least 35 people are in hospital with injuries, officials say.