The U.S. attorney in Manhattan is investigating whether the lack of New York City taxis with wheelchair access violates a section of the American With Disabilities Act.
The investigation was revealed on Monday in letters mailed to city lawyers and owners of taxi medallions, reports The New York Times.
The paper says it could result in the government bringing a civil case against the Taxi and Limousine Commission.
The city doesn't require taxi owners to provide wheelchair access. But it has said it does issue medallions for wheel-chair accessible taxis and that taxi officials plan a program whereby the disabled could arrange cab rides by telephone.
The U.S. attorney's office declined to comment on Monday.