Police have escorted students from the grounds of Bayfield High School which is now closed for the day after an emailed "bomb threat" this morning.
Police said at noon a visible presence would remain at the school while enquiries were continuing.
Bayfield acting principal Mike Beagley thanked parents and caregivers for helping the managed evacuation to run smoothly.
"At this stage our intention is to have school as normal tomorrow, but this is subject to an all clear from the police which we hope to receive later today.
"We ask at this stage that all staff and students remain off site until further notice."
An earlier notice sent to parents at 9.30am said as a precaution the school had been closed for the day and a "managed evacuation" would take place.
Parents were lined up on Musselburgh Rise as groups of students were escorted out of the school.
One parent said she received communication from the school saying there was an email with a bomb threat.
A student who was escorted out said she thought it was just a drill this morning. Students were dispersed in groups into different classrooms. No one was that scared.
"School is in lock down effective immediately. All students on site will be held safely.
"Please keep your son or daughter at home if they have not left for school yet," the school said in a message to parents.
The incident comes almost a year after the school was locked down for two hours last November following an online threat.
Police were making enquiries into a threatening email sent to the school this morning, a spokeswoman said.
"We were alerted to the incident at around 8.17am this morning.
"Police are working to establish the origin of the correspondence."
Cordons were in place and a visible police presence would be in the area while enquiries continued.
