Calcutta attacker 'seen clearly' on tape

Closed circuit TV filmed the attack taking place

Police in the Indian city of Calcutta say they have clues as to the identity of at least one of the gunmen who attacked the American cultural centre on Tuesday.

Police are convinced there was a second bike

Indian intelligence agencies have reportedly ruled out the attackers being either Kashmiris or Pakistanis.

Tape from closed circuit television cameras at the centre clearly shows the face of one of the attackers riding on the back of a motorcycle.

He has a moustache and is dressed in green commando-style clothing with a shawl draped over him, from under which he pulls out an AK-47.

His picture is being circulated across the city.

The attack, in which five policemen were killed, has led to accusations by the Indian Government that a group suspected of involvement has links to Pakistani intelligence.

Second bike

The video footage is also said to show the driver of the motorbike drawing a pistol and opening fire as well.

The camera tapes have produced vital clues and now we are zeroing in our investigations

Calcutta police detective Saumen Mitra

Policemen are shown ducking for cover, several of them stumbling because of bullet wounds.

Investigating officials say the footage is blurred after this point and so does not show a second motorbike believed to have taken part in the attack.

Officials say they are sure there was a second group of gunmen because of the number of spent AK-47 cartridges found at the scene.

Questioning

Reports from Calcutta on Thursday said more people had been picked up by the police for questioning.

More than 50 are already being questioned about the incident, although it is not clear how many have been formally arrested.

At least two Bangladeshis are amongst those detained, leading to a protest from the authorities in Dhaka.

On Thursday, 12 people returning from an Islamic religious congregation in Bangladesh were arrested in Calcutta.

Police said they had evidence they might be linked to the Pakistani intelligence service, although they did not give any details.

Police did not give any more details.

An FBI official is reported to have flown to Calcutta, although is not clear what role he might play.

The West Bengal state government has said that US agencies will not be allowed to join the investigation.