(Xinhua) -- A suicide attacker exploded himself near the vehicle of intelligent service members in eastern Afghan province of Khost, killing two intelligent agents and two civilians on Friday morning, said a police official. Abdul Qayum Baqizai, the provincial police chief told Xinua that it occurred at 10 a.m. (GMT 0530) in the Jaji Maidan district when a suicide bomber with explosive material strapped to his body exploded himself next to the vehicle of Afghan intelligent service member killing two agents and two civilian passers-by. "Seven more were injured in the blast including a former senior intelligence official named General Azizullah," Baqizai said. No one or individuals have yet to claimed responsibility. Taliban militants have carried out several similar attacks against interests of government and international troops. Conflicts and spiraling insurgency have claimed the lives of over 4,000 people mostly militants so far this year in the war-torn country.