Security at three Concord schools will be elevated Friday in response to a threatening letter received at Concord High School Thursday afternoon.
The letter indicated students would be shot at Concord High Friday morning, according to phone messages sent out to parents by district Superintendent Steven Lawrence and Concord High School principal, Gary McAdam.
Concord Police is investigating the threat and will provide security at the school Friday, according to the messages.
They will also be present at El Dorado Middle School and West Wood Elementary, because of their close proximity, said Lawrence.
The threat to Concord High School comes six days after Alhambra High School in Martinez received a threatening email and the same day that school was in response to a teacher finding an empty hand-gun case.
Lawrence said Pleasant Hill police, Walnut Creek police and the Sheriff's Office have been notified of Thursday's threat.