WEST ALLIS, Wis. -- About 10 people were taken to the hospital after they were sickened by carbon monoxide fumes at a suburban Milwaukee bowling alley on Wednesday.

Witnesses said bowlers participating in a Wednesday bowling league at Riviera Lanes in West Allis began feeling light-headed and nauseated.

Firefighters from several area departments responded and found a high level of carbon monoxide in the building. The source of those fumes is under investigation.

Those overcome were taken to St. Luke's Hospital in Milwaukee, which has the largest hyperbaric chamber in Wisconsin.