Mass shooting in Washington DC naval yard

Another mass shooting in US

At least 12 have been confirmed dead and several injured, after a shooting at a Navy Yard in Washington DC. Witnesses say a gunman was shooting from the 4th floor at people in a cafeteria. Reports claim two or three gunmen may have been involved in the attack. Several civilians and police officers are among the victims. Approximately three thousand people work at the building, where the largest of the Navy's command systems is situated. For more , RT talks to political commentator John Wight.