A Pakistani court on Monday sentenced to death two leaders of a group called "the Jundullah organization" for killing two men in an attack two years ago, a lawyer said. Atta-ur Rahman, the chief of the Jundullah organization, and his deputy Shahzad Bajwa were convicted Monday of shooting and throwing a grenade at a military pickup truck in the southern city of Karachi in March 2004, killing a soldier and a bystander, prosecutor Maula Bakhsh Bhatti said. "We had proved our case without any doubt and the judge duly acknowledged it and punished them," Bhatti said of the ruling by trial judge Feroz Mahmood Bhatti of the anti-terrorism court in Karachi. The pair's defense lawyer, Mohammed Ramzan Syed, said he will appeal the convictions because they were based on "flawed evidence," according to a report of the Associated Press. Last month, the same court sentenced Rahman and 10 other men to death for an attack on a senior army general in Karachi in June 2004. The general survived but 10 others were killed. Rahman has already filed an appeal against that conviction. Police say Jundullah, is suspected of being behind a car bombing outside the U.S. consulate in Karachi on Thursday that killed a U.S. diplomat and three other people.