Durham Regional Police Service (DRPS) is investigating a bomb threat to Port Perry high school.
The R.H. Cornish Public School and nearby schools were placed into Hold and Secure for safety reasons. The R.H. Cornish Public School was evacuated.
The Durham District School Board (DDSB) later announced that the hold and secure had been lifted.
It said the DRPS assisted school staff with a controlled exit of students. It advised parents and guardians to expect a longer than anticipated arrival time for students on school buses.
Earlier, the DDSB said the bomb threat delayed student dismissal times.
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