A Special Investigation Team would probe the twin bomb blasts that rocked the Bangalore-Guwahati Express today, leaving a woman dead and 11 others injured.

Tamil Nadu DGP K Ramanujam said after the Railway Police registers the case into the explosion, the investigation will be taken up by a Special Investigation Team.

"It is not a major blast. It is suspected that Chennai could not have been target of those who were behind the blast because the train was running late. Some other location could have been the target," Ramanujam said.

He said police have no immediate information on who was responsible for the explosion in which 11 people were injured.

"It is premature to say what kind of device was used is the blast. Damage to the train is not heavy," he added.

Union Home Secretary Anil Goswami said one person was killed while 10 others were injured in the blast.

"We are in regular touch with the Tamil Nadu Government and have sought a report about the incident," he said.

Asked whether the blast can be termed as a terror attack, Goswami said it was too early to arrive at any conclusion.

"We are still waiting for the details," he said.

Home Minister Sushilkumar Shinde is currently in Himachal Pradesh for campaigning for the Congress candidates.

"I am away in Himachal. I have directed my officials to provide all assistance to the state government," Shinde said.

A team of National Security Guard and explosive experts is likely to be sent to Chennai to join in the investigation into the blast.

NIA team from Hyderabad is being rushed to the blast site, official sources said.

Railway Board Chairman Arunendra Kumar said a dog squad, medical teams and RPF teams have reached the spot.

"It seems the blast took place under a berth and one passenger has lost life in the blast," he said.

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