Shortly after the 14-hour ordeal ended, the police began their investigation. According to Brigadier Raj Seetapathy, the gunmen carried letters in Urdu which affirmed their connection with an organisation called Tehrik-E-Kasas or Movement for Revenge, a previously unknown group to law enforcement officials. The letters suggested that the gunmen carried out the attack "because they could not tolerate what happened to children, women and Muslims during the Gujarat riots." The letters were translated for the National Security Guard (NSG) by Maulana Dawood Kausar Ashrafi of the Jama Masjid of Gandhinagar. Upon reading these letters, the officials believed that Tehrik-e-Kasas was formed specifically to avenge the Gujarat riots.