The Ontario Fire Marshal's Office has been called in to investigate a fire that destroyed the Cambridge OPP detachment on Beaverdale Road.
Damage is now pegged at $1 million.
Officials say a fire broke out around 2:30 p.m. on Tuesday, and everyone managed to get out safely.
It's believed the fire started in the attic and that's why smoke alarms did not go off sooner.
"We are focusing on some maintenance that was being done on an emergency generator. We're in the early stages of our investigation." Manny Garcia, with the Ontario Fire Marshal's Office, told 570 NEWS.
Garcia adds that some heavy equipment will be brought in to take the building apart, to allow for greater access.
Firefighters were on scene dealing with hot spots for several hours.
In the meantime, officers with Cambridge OPP will be working out of the Milton detachment.
with files from Erin Anderson, Blair Adams and Jeff Pickel