No one was injured when an improvised explosive device detonated Monday and damaged the front of a building in a west-end industrial park.

Police say they were called to the Boilermakers Apprenticeship Administration Agency and union complex near 152nd Street and 114th Avenue at around 8 a.m., where an IED had detonated and damaged the front door of the building.

About 20 people were evacuated from the building and from the surrounding area as a precautionary measure, police say.

Police aren't sure when the IED detonated.

"There were no other signs of any other IEDs in the area, so we believe this was an isolated incident and there's no risk to the public," said Edmonton police spokeswoman Cheryl Sheppard. "And luckily no one was hurt when the IED did go off."

Police don't believe the IED had the potential to cause greater damage, Sheppard said.

"We're still very concerned any time we locate a device that has the potential to cause any damage to people or structures."

Police are now monitoring surveillance footage to determine how the device ended up at the building. No one is in custody.