INDIANAPOLIS (AP) — Crews are inspecting the roof of the Lucas Oil Stadium in downtown Indianapolis after three people were injured by a bolt that fell during Thursday night’s Colts game against the Bengals.

Capital Improvement Board executive director Barney Levengood says two minutes before halftime a bolt was sheared off by the retractable roof as it was being opened. The bolt fell into a seating area, striking two men and a woman. All three suffered minor injuries.

Colts fan Robert Fickle says the fallen bolt was the size of a half-roll of quarters.

Levengood tells The Indianapolis Star that once the roof inspection is complete more information would be released.

The next gathering on the stadium’s schedule is a Sept. 12 event for about 220 people with a financial planning firm.