Update, 1:15 p.m.: The high school has been cleared for students and staff to re-enter, according to the district's website.
Lunch will be provided and all afternoon and evening activities will proceed as scheduled.
Update, 12:15 p.m.: Central York does not plan to dismiss its high school students early, according to a post on the district's Facebook page. The district is also making plans to provide all of its students with lunch, according to the page.
Update, 11:30 a.m.:
Central York High School students, faculty and staff have been safely evacuated after a bomb threat, according to a post on the district's Facebook page.
The Springettsbury Township Police Department is in the process of conducting a canine sweep of the building, said chief Tom Hyers.
The post stresses that parents and guardians should not yet travel to the campus, as police are still searching and securing the facilities.
Central York High School received a bomb threat this morning, spokeswoman Julie Randall Romig wrote on the district's website.
The building has been evacuated, and police are searching the school and campus at this time, she said.
"We are asking parents and guardians to not come to the school at this time so that police can secure the campus and facilities and provide further direction in the interest of student, faculty and staff safety," Romig said.
Check back later for more details.