Earlier, three sources familiar with the investigation said police were checking whether there was a link between the blast and the previous arrest of a group of seven men from the restive Kashmir region with arms and bomb-making material. Indian authorities are investigating the blast under a stringent anti-terrorism law and have said that all angles are being probed. Police found two pistols, two assault rifles and 2,900 kg of bomb-making material during the raids, a Kashmir police statement said. India accuses Pakistan of supporting Islamist militants in Kashmir, the Himalayan region which both nations claim, but Islamabad denies the accusation. Following the Delhi blast, Kashmir police carried out raids at hundreds of locations in the Himalayan region and about 500 people were detained, a Kashmir police source told Reuters.
