Bloomington police are asking people who attended last Saturday's Criterium bicycle race to review any cell phone or other personal video they might have of the event.
Police are seeking clues as to who was responsible for throwing thumb tacks onto the path of cyclists. The tacks caused flat tires resulting in an eight-bike crash.
Five cyclists suffered injuries ranging from serious scrapes and bruises to contusions.
Chief Brendan Heffner said video from public surveillance cameras downtown have so far yielded no clues, and no witnesses have come forward.