Story highlights An elaborate tunnel was discovered near Pan Am Games venue in Toronto

Nothing so far suggests criminal activity or terrorist intent, police say

Police Deputy Chief Mark Saunders: "There is no criminal offense for digging a hole"

(CNN) A big hole in the ground discovered near a venue for the 2015 Pan American Games in Toronto has stumped authorities looking into it.

The mysterious tunnel measured more than 6 feet in height, nearly 3 feet in width and about 33 feet in length, Toronto Police Deputy Chief Mark Saunders told reporters Tuesday.

Plywood walls were reinforced with wooden supports. The tunnel was 10 feet underground, with a ladder leading down to the chamber.

A rosary with a Remembrance Day poppy hung from a nail on the wall. Remembrance Day honors Canadian veterans who died in combat.

"What does that tell you?" a reporter asked the deputy chief.

Read More