CLAYTON, Mo. (AP) — The NAACP chapter in St. Louis County called for an independent committee to investigate ballot problems in the county.

Ballot shortages impacted more than 60 precincts during the April 5 municipal election. The county is already conducting its own investigation, as is the Missouri Secretary of State’s office and a Missouri House committee.

But in a letter to County Executive Steve Stenger dated Sunday, NAACP chapter president Esther Haywood requested a bipartisan group investigate and make recommendations for improvement.