The incident happened around 10 a.m. local time at the North Park Elementary school in San Bernardino.
Based on preliminary information, there were 4 victims, with the suspect possibly down as well, San Bernardino Police Chief Jarrod Burguan posted on Twitter.
One of the victims is believed to be a teacher and responders are on scene treating victims, Maria Garcia, communications officer at San Bernardino Unified School District, told Fox News.
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