Kolkata: The army was called out to quell violent protests in Kolkata as new trouble broke out in a political row over the killing of villagers opposed to surrendering land for industry in Nandigram.

Soldiers with automatic rifles patrolled the heart of the usually bustling city after protesters hurled stones, shattered car and bus windscreens, burned vehicles and blocked traffic.

An Indian soldier patrols the streets of Kolkata, 21 November 2007, during a large-scale violence. AFP Photo/ Deshakalyan Chowdhury

It was the first time in years that the army had been ordered to bring peace to a major city, in what some analysts said was a major embarrassment to the state’s communist rulers who have been accused of failing to stop violence by their cadres.

The trouble began after a protest march called by the All India Minority Forum turned violent. Hundreds of demonstrators hurled stones and bottles at riot police in the narrow streets of central Kolkata.

Riot police retaliated by firing tear gas at the protesters and cordoned off the area to prevent the trouble from spreading, witnesses said.

"People were allowed to move in the streets with their hands on their heads. Many have been held up in offices," Swati Ghosh, who works in the area, told Reuters by phone. "We hope the situation improves by evening."

RAF personnel firing tear-gas shells on activists of All India Minority Forum protesting against violence in Nadigram and demanding cancellation of visa of controversial writer Tasleema Nasreen at Rippon Street in Kolkat on Wednessday. PTI Photo

Police said at least 30 vehicles had been damaged, some of them set on fire, and several protesters and policemen injured.

"We are trying to bring things under control, there seems to be trouble everywhere," said Jawed Shamim, a top city police officer.

West Bengal has been roiled by weeks of protests against the killing of villagers in Nandigram by suspected communist cadres in a turf battle that began earlier this year.

Communists under pressure

West Bengal’s ruling communists, who are allies of the coalition government at the centre, lost control of Nandigram earlier this year after trying, unsuccessfully, to get villagers to vacate their land to make way for a chemicals complex.

Local opposition parties and Maoist rebels moved in, and the area became a no-go zone for communists and police alike.

Indian protesters throw stones to the police in Kolkata, 21 November 2007 during a large-scale violence. AFP Photo/ Deshakalyan Chowdhury

The latest trouble came after a two-day strike this week over the issue in West Bengal and its neighbouring state of Bihar, during which Maoist rebels blew up railway tracks, disrupted train services and blocked highways.

The All India Minority Forum said the demonstration was also aimed against West Bengal giving refuge to a controversial Bangladeshi Muslim woman author accused of criticising Islam in her books.

"It was a peaceful protest. I don’t know how this turned violent. We are clueless," said Idris Ali, chief of the forum.

The violence in Kolkata disrupted the proceedings in Parliament in New Delhi as angry lawmakers shouted their communist counterparts down in the Rajya Sabha, leading to chaos and forcing the chamber to be adjourned for the day.

An Indian police opens fire tear gas on protesters in Kolkata, 21 November 2007, during a large-scale violence. AFP Photo/ Deshakalyan Chowdhury

"The ruling left front has failed to protect the people of Nandigram, the people are terrorised by the left parties," the opposition leader L.K. Advani said, referring to the government of West Bengal, the world’s longest serving democratically elected communist government.

"We are witnessing the end of communist-rule world over and Nandigram will be a turning point in the politics of West Bengal."

(Additional reporting by Bappa Majumdar and Nigam Prusty)