One dead in bomb blasts at India train station: Official

CHENNAI, India (AFP) - Twin bombs planted on a train killed at least one person and wounded nine others in the main southern Indian city of Chennai on Thursday, a railway official said.

The explosion, which comes as India holds mammoth general elections, went off in a carriage of an overnight train from Bangalore as it pulled into Chennai central station shortly after 7am, official Rakesh Misra said.

A 22-year-old woman was killed when one of the devices which had been placed underneath her seat exploded, said Mr Misra, general manager of the southern region for Indian Railways. "At least two people have suffered grievous injuries and seven have minor injuries," he told reporters in comments aired on Indian television.

"Civil police... are investigating what kind of bomb it was and why anyone could have placed the bomb."

Security has been tightened across India as the country holds a six-week general election which has been marred by deadly violence in other parts of the country, including attacks by Maoist rebels.

Voting has already taken place in most major cities, including Chennai, which went to the polls last week.