The release of Lashkar-e-Tayiba chief Hafeez Muhammad Saeed, hardcore Lal Masjid cleric Maulana Abdullah Aziz, and now Tehrik-e-Nifaz-e-Shariat-e-Mohammed chief Sufi Mohammad has cast serious doubts over Pakistan's claims that it is seriously acting against the Taliban and other home grown terror outfits, a senior US intelligence official has said.