The Afghan national accused of shooting a two National Guard troops in Washington, D.C., was part of an elite CIA unit in Afghanistan, members of which have struggled to adjust to life in the United States.

The suspect had been recruited to Unit 03 of the Kandahar Strike Force, a former military commander told the BBC, coming to the US after the withdrawal.

FBI investigates motives behind ambush shooting near White House; suspect identified as Afghan national Rahmanullah Lakanwal.