Pakistani Interior Minister Rehman Malik said authorities believe one boy distracted the driver in which Malala Yousufzai was riding, while the other asked someone to point her out before she was shot in the head, CNN reported.
"Obviously they had done their homework," Malik said. "They had seen the vehicle of Malala going up and down, and accordingly they acted on that."
Police told the U.S. news network that along with the two boys they were looking for a man, identified by Malik as Attah Ullah Khan, a 23-year-old chemistry student they believe drove them to the van. The boys were not identified.
Six other men were arrested in the case last week.
Malala, who has gained international attention since she was 11 and started pushing for girls' education, was on the school van in the Taliban-held Swat Valley Oct. 9 when the attack occurred.
She is recovering at a hospital in Birmingham, England. Malik visited Monday, CNN said.