A Brazilian bomb squad was called into action Saturday as a controlled explosion of an unattended bag was carried out near the finish line of the men's Olympic cycling road race.

With competitors still more than 40 miles away from the finish, reporters heard a loud boom on the press tribune and felt the ground shake. No one was injured, and the event went on unaffected.

A half dozen military police cordoned off the area. Local reports suggested the bag may have belonged to a homeless person. 

Also Saturday, a military bullet pierced the roof of the media tent at the Olympic Equestrian Center. 

The incident occurred during the lunch break at the dressage event. The competition was not disrupted and nobody was hurt.

The bullet landed inches from one of the media tables at the end of the room where the press conferences are held, leaving an obvious hole in the roof.

The arena is located near a military compound.

The Associated Press contributed to this report.