Three fans have been injured after a bolt fell from the roof of the Lucas Oil Stadium during an NFL pre-season game between the Indianapolis Colts and Cincinnati Bengals.

The incident happened at half time as the retractable roof was opened at the stadium, resulting in two of the fans being taken to a nearby hospital with non-life threatening injuries.

A statement from the Capital Improvement Board of Managers, which operates the stadium, said: "With approximately two minutes remaining at half time at the Indianapolis Colts vs. Cincinnati Bengals game this evening at Lucas Oil Stadium in Indianapolis, there was an occurrence with the movement of the retractable roof.

"The roof was in the process of being opened for the second half of a pre-season game. A bolt from the fixed sheared and dropped into seating section 248. Once the stadium authorities were notified, the movement of the roof was stopped immediately."

Cincinnati went on to win the game 9-6.