The Afghan national accused of opening fire on two National Guard members near the White House worked with a CIA-backed military unit during the war in Afghanistan, the Central Intelligence Agency said.

Two West Virginia National Guard members remain in critical condition after the ambush-style attack on Wednesday just blocks from the White House. NBC News has learned the suspect is 29-year-old Rahmanullah Lakanwal, according to four senior law enforcement officials who say his last known address was in Washington state.