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DENVER — A class-action lawsuit has been filed against the city of Denver over disability access at Red Rocks Amphitheatre.

Six people with disabilities filed the lawsuit on Thursday, claiming the city-owned concert venue and its contractors “have implemented policies that have the effect of excluding patrons who use wheelchairs from all but the most distant seats.”

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The lawsuit claims the city is violating the American with Disabilities Act because it is denying people with disabilities “meaningful access” at the venue.

People who use wheelchairs can only use special seating areas in the first or 70th rows of the famed amphitheater. But those who sued said the front-row seats are usually not available.

The lawsuit claims the front-row seats are routinely sold out and purchased by people without disabilities. The tickets are then found on the secondary market at severely marked-up prices.

The lawsuit claims the city and its contractors are not doing enough to stop people without disabilities from purchasing the front-row tickets.