The only surviving terrorist who was apprehended live by the Mumbai Police, Ajmal Kasab, disclosed that the attackers were members of Lashkar-e-Taiba as The Government of India declared that the attackers came from Pakistan as Indian government officials said that the attacks were so sophisticated that they must have had official backing from Pakistani “agencies”, an accusation denied by Pakistan. However, on 7 January 2009, Pakistan confirmed the sole surviving perpetrator of the attacks was a Pakistani citizen.
Mumbai police originally identified 37 suspects—including two Pakistani army officers—for their alleged involvement in the plot. One of these men, Pakistani American David Headley was found to have made several trips to India before the attacks and gathered video and GPS information on behalf of the plotters.
Pakistan, coming under pressure from the US and the United Nations, arrested a few members of Jamaat-ud-Dawa (JuD), including founder Hafiz Saeed, and put Saeed under house arrest, but he was released a few days later. In June, 2009 when the Lahore High Court, deeming the containment to be unconstitutional, ordered Saeed to be released, India expressed its disappointmentwith the decision. He was again put under house arrest in September 2009 only to be freed from all charges in October by the Lahore High Court.
Meanwhile, a year after the attacks, the Mumbai Police continued to complain that Pakistani authorities were not co-operating by providing information for their investigation. On 9 April, 2015, one of the main masterminds behind the 26/11 attacks, Zaki-ur-Rehman Lakhvi, was granted bail in Pakistan. Some of the other handlers including Sheikh Abdul Khwaja and Abu Hamza were nabbed by the R&AW agents and the Delhi Police respectively. Meanwhile, in December, 2009, the FBI charged Abdur Rehman Hashim Syed, a retired Major in the Pakistani army, for planning the attacks in association with Headley.