One bomb expert was killed and five others, including two policemen, were injured in a series of 12 bomb blasts and grenade attacks in Assam on Wednesday.

In an attempt to defuse a bomb found at a place under Abhayapuri police station in Bongaigon district, one bomb expert died when the time device exploded, police said.

The Abhayapuri police station officer-in-charge who was accompanying the bomb expert was also injured.

Four of the bombs went off in Guwahati alone.

The bombs went off almost simultaneously across the state starting from upper Assam's Namrup, going down to lower Assam's Dhubri township.

Unconfirmed reports said a telephone exchange in central Assam's Nagaon district was gutted after a blast.

A bomb was found at the Jet Airways [Get Quote] counter at the Guwahati airport. A bomb disposal squad of the army has been dispatched to the airport, sources said.

Militants of the banned United Liberation Front of Asom are suspected to be behind the blasts.

Army's signal intelligence unit on Wednesday night intercepted a message, which talked about the "fireworks having started."

The blasts occurred near a hospital close to the state's administrative capital, inside the airport taxi stand, the commercial hub of the city, Fancy Bazar, and at Sonapur in the outskirts of Guwahati.