TRACY -- Students were sent home from a high school here Monday morning following a bomb threat, the third threat against a Tracy school in the past two weeks, school district officials said.
Students at Kimball High School at 3200 Jaguar Run were dismissed from class after a note was found in the boys locker room just before 8:30 a.m. Monday, Tracy Unified School District spokeswoman Jessica Cardoza said.
The contents of the note were not released by school officials.
Police and bomb-sniffing police dogs remained on campus searching for a potential threat for most of Monday.
"We don't anticipate that check to be concluded by the end of the day so students are being released to parents and guardians ...," Cardoza said.
The incident comes in the wake of another evacuation at the school on March 8, after two students found threatening graffiti in a girls bathroom.
Cardoza also declined to provide details about that message but said it did not contain a threat to a specific group of people nor did it mention a gun or shooting. Extra police and security were at the school last week.
Tracy High also was evacuated last week after two threatening notes, including one about a bomb, were found in two boys bathrooms on Wednesday afternoon.
Police later arrested two Tracy High students in connection with those threats. Their names were not released because they are minors.
Police also said they believe the threats at the high school were likely the antics of students and were done to disrupt the state-mandated high school exit exam, which was given during the week.
In Fremont last Thursday, a 14-year-old student at Thornton Junior High School was arrested after he called the school multiple times with bomb threats. His name also was not released.
It was the second day in a row that the school received threats, and Fremont police said it was unlikely the teen was acting alone. They are continuing to investigate whether others were involved. Thornton Junior High was never placed on lockdown, Fremont police said.
Meanwhile, in Pleasanton, extra patrols at Foothill High School were on duty after a graffiti threat was found in a girls bathroom.
Foothill High Principal John Dwyer sent a note to parents and staff about "a possible threat toward the school," after the graffiti was discovered. The threat was unfounded.
Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.