DURANGO, Colo. -- Sheriff's officials said a bicyclist who organized a charity race was injured by a small cannon blast and investigators suspect five teenagers of the crime.

The La Plata County Sheriff's office said they plan to interview the teenagers with their parents next week about the blast that was fired at the bicyclist Sunday during a multiple sclerosis fundraiser in Durango.

Authorities said the cannon was similar to what is used at high school and college games to celebrate a touchdown.

Lt. Ed Phippen of the sheriff's office says black powder and a paper wad holding the powder blasted out of the cannon. Phippen says the powder burned 37-year-old Ian Altman's legs.

The explosion lodged small pieces in Altman's legs and arms. He finished the race, then later was briefly hospitalized with a fever and possible infection.