By Rajeev Khanna
BBC correspondent in Ahmedabad
Police in the western Indian state of Gujarat say at least 14 people have been injured in a blast at a railway station in the city of Ahmedabad.
The explosion went off before dawn
They say the explosion, which tore through a platform roof, had been caused by a powerful explosive.
There is no indication of who might have been behind the attack.
More than 1,000 people, mostly Muslims, died in riots in Gujarat four years ago, after an attack on a train, which killed 59 Hindus.
Sunday's explosion went off before dawn just after two trains had passed through Kalupur railway station in Ahmedabad, and shortly before the Kutch Express was due to arrive.
The roof of the platform was blown off, and glass in nearby kiosks and offices shattered.
The police said the device used was not "crude", and said security had been tightened.
Rail traffic was suspended for two hours, but has now resumed.