Call for Navy security review
US politicians are calling for a review into how the suspected gunman in Monday's rampage at the Washington Navy Yard received and maintained a security clearance, despite a history of violent episodes.
Checks on gunman 'only revealed traffic violation'
The firm that hired Aaron Alexis said they did two background checks on the suspected Washington gunman, which revealed no issues other than one minor traffic violation.
IT company The Experts said it twice confirmed Alexis's security clearance with the US Defence Department.
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Security clearance questions over Washington gunman
Despite having serious mental health problems and previous incidents with firearms, Aaron Alexis held security clearance for the Navy base.
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FBI probes fatal shooting at Washington Navy shipyard
At least 13 people, including the suspected gunman, have been killed in a shooting at a Navy base in Washington DC.