Democratic presidential candidates Hillary Clinton, Bernie Sanders and Martin O'Malley once again called for action to end gun violence Wednesday as police in San Bernardino responded to an active shooter situation that has left as many as 20 people wounded.
The situation is developing. FBI and ATF teams are on the scene, which is reportedly an office complex that houses the Inland Regional Center, which serves people with developmental disabilities. Police say there are one to three assailants who are reportedly heavily armed. Reuters reports that at least three people are dead, citing "authorities and a witness."
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