By: Maureen Magee and Hailey Persinger
Published: October 8, 2010
San Diego — Toler and Bay Park elementary schools were taken off lock down status at around 4:30 p.m.
UPDATE 4 p.m. - Mission Bay High School has been taken off lock down status and all students were sent home at about 3:25 p.m., said the San Diego Fire Department. Lock downs for Bay Park and Toler elementary schools are still in effect.
UPDATE 2:40 p.m. - About 140 students have been isolated and are being screened for mercury contamination at Mission Bay High School after officials found that they'd entered classrooms with dangerous levels of the substance.