A suspicious package prompted an evacuation of the riding office of Quebec Justice Minister Simon Jolin-Barrette Thursday morning.

Staff at the Belœil office, in Quebec's Montérégie region, opened a letter around 10:30 a.m. and noticed an unknown white substance. They then called 911.

Police arrived on scene and evacuated the building as a bomb squad was called in to retrieve the package. The case was transferred to provincial police. 

Stéphane Tremblay, a spokesperson with the Sûreté du Québec (SQ), said Thursday evening the written letter contained "insults" directed at the minister, but not threats. The unknown substance turned out to be sugar after lab testing.

The SQ investigation is ongoing.