At least one person opened fire in the Southern California city of San Bernardino on Wednesday and as many as 20 people were wounded, authorities said.
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The San Bernardino Police Department said on Twitter that it had "confirmed 1 to 3 possible suspects" and multiple victims in the shooting. The agency called it an "active shooter" incident.
The San Bernardino Fire Department said in a tweet that it was responding to reports of 20 victims.
The Los Angeles Times reported that the shooting took place at about 11 a.m. at a social service office in San Bernardino.
A police spokeswoman told the Times that the suspects were heavily armed and possibly wearing body armor.
A spokeswoman from nearby Loma Linda Medical Center said the hospital was expecting patients momentarily. "We're all kind of on standby right now - it could be any minute," spokeswoman Briana Pastorino said.