"Preliminary info is 4 victims, being treated," city police chief Jarrod Burguan said on Twitter.
"We believe this to be a murder suicide. Happened in a classroom. Two students have been transported to the hospital."
In December 2015, a newlywed couple apparently inspired by the Islamic State group opened fire on an office party in San Bernardino, killing 14 people and injuring 22 others.
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