Someone supposedly saw an armed subject, but if it was a student, that wasn't mentioned:
** UPDATE at 1:05 pm: A spokeswoman for the Pasadena Unified School District told CNN that a student reported that someone on campus had a gun. Students were evacuated as a precaution, she said. No shots have been fired and police continue to investigate.
12:59 pm: That's what KCAL is reporting, as video shows students filing out of the Pasadena school building with their hands behind their heads.
The presence of a gunman has not been confirmed. Police are on the scene, doing a floor-by-floor search. No reports of shots fired."
The school is locked down...