Toronto Police are scrambling for clues as to who dug an underground tunnel near York University and what it was used for.

On January 14, a Conservation Officer found a large pile of dirt near the fence line of the Rexall Centre Sports and Entertainment Complex in Toronto’s Black Creek Park.

When police were called, a tunnel spanning 33′ was discovered. It was over 6′ high and 3′ wide. The walls and roof were supported by lumber.

Inside the tunnel investigators found a generator, gas cans, food and drink containers, work gloves, a wheel barrow, lightbulbs, and a sump pump. There was a rosary and poppy pinned to the wall. The entrance was covered by dirt and a wooden lid.

Police say the tunnel has not been linked to any criminal activity or terrorist groups.

“I don’t have a working theory. We’re open. We go with the evidence,” says Deputy Chief Mark Saunders at a news conference. “This was built with a considerable amount of sophistication.”

Since the discovery the tunnel has been filled in. There is no threat to public safety.

Anyone with information is asked to contact police or CrimeStoppers.