Fedayeen al-Islam (also spelled Fedayan-i-Islam, variously translated as "Islamic Commandos" or "Islamic Patriots") was a militant group in Pakistan under the leadership of Hakimullah Mehsud, who was a deputy to Baitullah Mehsud in the Tehrik-i-Taliban Pakistan (TTP) prior to Baitullah's death.
He said he called the number and then heard a recording in which the group admitted launching Saturday's attack.
The Arabiya television correspondent said the speaker spoke in English with a South Asian accent.
The Fedayeen Islam group has issued several demands including for Pakistan to stop its cooperation with the United States.
[1] The group also claimed responsibility for a suicide bombing that targeted a Shia mosque in Chakwal, Punjab province.