One of the cyclists concerned about an apparent act of bridge sabotage in the Don Valley trail system filed a complaint with police on Monday.

Damage to a bridge that spans the hillside of the ravine near Overlea Blvd. and Thorncliffe Park Dr. was first spotted two weeks ago. Timothy Charles, the founder of the Toronto Off-Road Biking Association, said the supporting beam of the bridge appeared to have been deliberately cut in several places. The cuts put the bridge at risk of collapsing, and cyclists dismantled the bridge for safety.

Charles said the same bridge was similarly vandalized last year. That incident didn’t have the potential to be as dangerous as the recent damage, but he said the fact the same structure has been the target of multiple “attacks” concerns him and other cyclists.

“This is the most serious thing that we’ve seen so far,” he said. “The main reason for contacting the police was just to establish a record of all these occurrences.”

Charles, who rides trails in the area every day, said he thinks the vandalism is being committed by one individual. Last winter, he and other trail users found a single set of large boot prints in freshly fallen snow around vandalized areas.

“We’re just monitoring. We don’t know who it is,” he added.

Police at 53 Division said Monday evening they would be handing the matter over to an investigating officer.

Although it is not a city structure, the department of parks, forestry and recreation was investigating the incident on Monday.

“We’ll be looking at what we need to do to make the area safe,” said spokeswoman Wynna Brown, adding that the department would have more information to add later this week.