Lawyers for a British man accused of hacking into U.S. military computers say sending him to the United States would violate his rights because he is autistic and would suffer unnecessarily if he were extradited.

U.S. prosecutors say 43-year-old Gary McKinnon broke into 97 computers belonging to NASA, the Department of Defense and several branches of the military soon after the Sept. 11, 2001, attacks. McKinnon says he was looking for evidence of UFOs.