The threat was not specific, so officials and police chose to close all five high school campuses, out of caution.
"I got up this morning, got dressed looked at my phone, I got a text," said Noah Gurvich.
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Redwood High School freshman Noah Gurvich says the message from the district superintendent said school was closed Friday due to a threat of violence, please remain home.
"I mean, it's kind of scary that someone would do that," said Gurvich.
The bomb threat which came into district headquarters, did not specify a target site. In a statement, Superintendent Tara Taupier said, "School administration immediately evacuated all buildings on all five district campuses and contacted local law enforcement to secure all sites."
Tam High, Redwood High, Archie Williams High and two other campuses were closed and searched by police.
"Out of an abundance of caution we determined we were going to shut down schools for the safety of all the the kids. We're starting our investigation into the credibility of the threat," said Captain Hamid Khalili from Central Marin Police.
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Police can't say where the threat of violence came from.
"I have no idea, we're following leads," said Khalili.
Noah's dad Leo told us by phone, he believes canceling school was the right call.
"You know you can never be too safe with all the school violence going on in the country, it's a safe community I wouldn't want it to change," said Gurvich.
By afternoon, the district sent a message to parents saying that after police sweeps, all schools had been declared safe. Weekend activities will go on as planned.