Hundreds of John Abbott College students were evacuated over the lunch hour on Monday but firefighters found no fire when they arrived on the scene.
Fire alarms had been set off at 12:07 p.m. by smoke coming from the roof of a building where workers were reapplying tar, said Melanie Drouin, a spokesperson for the Montreal fire department.
Alarms were triggered at three different buildings, the Casgrain, Penfield and Herzberg, said Debbie Cribb, a John Abbott College spokespersone.
Cribb said students and staff were evacuated from all three buildings as a precaution although the smoke was linked to the Casgrain building. She said crews were working on the roof there.
Initially, there was some confusion as to whether the fire alarm was linked to a Macdonald Campus building belonging to McGill University.
Drouin said the address to which the fire department responded was Rowles House, a McGill School of Environment building located at 21,111 Lakeshore Rd.
Doug Sweet, a McGill University spokesperson explained firefighters arrived first at the McGill building but they were escorted quickly by McGill security staff to the John Abbott building where the problem existed.
The escort service is an arrangement that has been set up in order to ensure emergency staff are directed as quickly as possible to the various buildings on the shared campus.
By 1:30 p.m., Drouin said, firefighters had left the scene.