Hamilton police are investigating reports of a mysterious white powder being sent to a business on King Street.

Police, fire and hazmat units were called to the sixth floor of a business at 1 King St. W around 11 a.m. An employee received the powder on Monday, police say.

The explosive device unit is also on scene to determine the substance’s origin. The building hasn’t been closed. There are no public safety concerns, police say.

The lane on the south side of King Street has been closed for emergency vehicles to get in and out.