Burlingame High School was briefly locked down Friday afternoon after a threatening email was sent to the school's office, a school district official said.
School administrators got an email from a student claiming to have a bomb and gun.
The school, located at 1 Mangini Way in Burlingame, was locked down shortly after 2 p.m. and police responded to the campus, according to Barbara Tufo, an administrative assistant with the San Mateo Union High School District.
Police found the student in class. They did not find any weapons on the student or on campus.
The student denied knowing anything about the email and was cooperative, Burlingame police said. They are investigating whether the student actually sent the email.
The lockdown was lifted shortly after 2:30 p.m. and parents were permitted to pick up their students at the school, Tufo said.
Parents were encouraged to pick up the students at the northwest entrance of the school's football field, she said.
An automated call went out to parents notifying them of the incident, Tufo said.
The school located one block from downtown has about 1,300 students and 120 teachers and staff.
Bay City News contributed to this report.