SAN RAFAEL (CBS SF) — Police placed San Rafael High School on lockdown Thursday afternoon due to an unidentified “threat situation” which resulted in a person being detained.

San Rafael police said at about 2:30 p.m. they were working on gathering more information about the threat to the high school at 150 3rd St.

By 3 p.m. police issued a notification canceling the alert and that the situation had been handled. Neither police nor school officials provided details on the detained person’s identity or whether or not the person was a student at the school.

No other information was immediately available.