U.S. authorities gave Indian investigators direct access to Headley,[6] but some in India have questioned why the U.S. had not shared suspicions about him with Indian authorities before the Mumbai attacks.[7] At the trial of Tahawwur Hussain Rana, an alleged co-conspirator, Headley gave detailed information about the participation of Pakistan's Directorate of Inter-Services Intelligence (ISI) in carrying out the attacks.[8][9] Since his arrest and guilty plea, Headley has cooperated with U.S. and Indian authorities and given information about his associates.[10][11][12][13] On January 24, 2013, a U.S. federal court sentenced Headley to 35 years in prison for his role in the Mumbai attacks.