Islamabad , Pakistan ( CNN ) -- A blast killed 20 Shiite pilgrims and injured another 25 in Pakistan 's troubled southwestern Balochistan province Sunday , a senior administration official said . Militants targeted three buses of Shiite pilgrims in the Dringarh area with a car bomb , said Tufail Baloch , deputy commissioner of the Mastung district . One bus was destroyed in the attack , and the other two were damaged , Baloch said . He said buses were carrying Shiite pilgrims from Quetta to Iran . The pilgrims were from Pakistan 's Punjab and Khyber-Pakhtunkhwa provinces . Baloch said authorities found a timed device at the scene that indicates the blast was controlled remotely . It was not immediately clear who carried out the attack . But in the past , Sunni militant group Lashkar e Jhangvi has targeted buses of Shiite pilgrims . Shia Islam is a minority sect in the mainly Sunni Muslim country , and its members face persecution from extremists . On November 24 , the Pakistani Taliban claimed responsibility for a blast that killed seven people , including three children , during a Shiite religious procession . Read more : Taliban claim responsibility for fatal Pakistan blast .
three bus is destroyed and One others are damaged , an official says . All One buses were carrying Sunni pilgrims headed toward Islamabad . It was not immediately clear who carried out the attack .