Photo: The Canadian Press

Police in Saskatoon are investigating the detonation of a suspected improvised explosive device at the provincial courthouse.

Emergency crews were called to the scene in the city's downtown just after 11 p.m. Wednesday.

Investigators said the blast damaged an entrance to the building which the courthouse shares, but no one was hurt.

Members of the police explosive disposal team were called in, along with a bomb-detection-trained dog unit.

Streets in the area were blocked for several hours while authorities investigated.

No arrests have been made.

Debris and a black smear on the sidewalk could be seen at the blast site, while a cover over the entrance was partially caved in.