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At least 12 people were believed killed in a mass shooting that happened at a center for the developmentally disabled in San Bernardino, California. The San Bernardino Fire Department tweeted at around 11.15am that first responders were on the scene in 1300 block of South Waterman Avenue. Fox 11 reported that San Bernardino police were scouring the area for as many as three white males dressed in military gear and ski masks. Initial reports suggested one shooter was responsible for the incident.