Kolkata, July 16 - Normal life was disrupted across West Bengal Thursday as enraged Congress party workers torched buses and obstructed rail and road traffic in protest against the attack on their party legislators Wednesday in Mangalkot in Burdwan district.

The Congress activists set fire to a bus on Howrah bridge, which links Kolkata with the busy Howrah railway station, police said.

'They (Congress workers) have obstructed all major road junctions across the state,' said a police officer.

Suburban and long distance train services of eastern and southeastern railway were badly hit as party activists blocked railway tracks.

Congress legislature party leader Manas Bhuinya told reporters that a 12-hour shutdown had been called in 12 of the 19 districts of the state Friday.