Police have cordoned off an area near Yonge and Dundas Square due to concrete falling off a building.

Chunks of concrete, the largest about the size of a pocket book, were seen on the ground at 21 Dundas Square just before 7 a.m.. The chunks fell in front of the doorway of the building.

Just before 8 a.m., police said the area would be reopened soon.

Police are investigating where the concrete came from.

No one was injured.