OMAHA, Neb. (AP) — A civil liberties group is threatening to sue the city of Lincoln over a new written policy limiting leafleting and other public commentary outside the city’s new arena.

The Nebraska chapter of the American Civil Liberties Union said Thursday it is considering a lawsuit over the policy, which was posted on the Pinnacle Bank Arena website earlier this week. It forbids leafleting, signature gathering and picketing in outdoor areas around the arena up to public sidewalks around the building, unless allowed by an arena tenant.

The policy comes after the March arrest of 77-year-old Larry Ball, who had been handing out religious pamphlets outside the arena. Police say Ball ventured beyond barricades despite several warnings, but Ball insists he was in a public area.

Charges against him were later dropped.