Washington reviewing claims that money is being diverted to militant group . The U.S. has been accused of using the program as a cover for covert operations in Pakistan and Afghanistan. Millions could run out of food in the next few weeks , U.N. says .
Washington reviewing claims that money is being diverted to militant group . U.N. estimates 60 percent of people who need aid live in militant-controlled areas . Millions could run out of food in the next few weeks , U.N. says .