Authorities called off the search for a bomb at in San Rafael after they could not locate any explosive device on campus, police said.
San Rafael police received reports from school officials that someone called around 9:13 a.m. saying there was a bomb at the school, located at 320 Nova Albion Way. Students were evacuated immediately.
The caller, who spoke in what sounded like "a disguised male voice," told the school officials that there was a bomb in one of school's restrooms, according to San Rafael police spokesman Charly Taylor.
Two bomb-sniffing dogs, from UC Berkeley and from the Alcohol, Tobacco and Firearms Bureau, were on the campus searching, while students waited on the school's field.
An outgoing message from Principal Lars Christensen said the students are sequestered, and that school and emergency officials were in the process of checking all the buildings on campus. He said everyone is safe.
Police called off the search at 11:45 a.m. after they could not find any evidence of a bomb. As an additional precaution, all after-school programs were canceled for the day, San Rafael police spokeswoman Margo Rohrbacher said.
Classes began at Terra Linda on Aug. 23. No suspects had been identified as of this afternoon and police do not know at this time if the caller was a student.
Bay City News contributed to this report.