Tehrik-e-Taliban Pakistan (TTP) had claimed responsibility for the December 16, 2014 attack on an army school in Peshawar that resulted in the deaths of at least 150 people, mostly children.
The announcement came hours after US Secretary of State John Kerry asked Pakistan to target all terror outfits like LeT, Taliban and the Haqqani network that pose a threat to itself, neighbours like India and America.
As a result of this designation, US nationals are prohibited against engaging in transactions with Fazlullah.
Fazlullah was elected TTP commander in November 2013, following the death of former TTP leader Hakimullah Mehsud.
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The Department of State designated TTP as a Foreign Terrorist Organisation and a Specially Designated Global Terrorist on September 1, 2010.
TTP was also listed at the United Nations 1267/1989 Al-Qaida Sanctions Committee on July 29, 2011.
Prior to becoming the leader of TTP, Fazlullah claimed he was behind the killing of Pakistani Army Major General Sanaullah Niazi in September 2013, as well as ordering the shooting of schoolgirl and activist Malala Yousafzai in 2012.