MADISON, Wis. (AP) -- Police have arrested a state worker who allegedly popped a protester's balloon at the state Capitol.

The state Department of Administration, which runs the Capitol and oversees the Capitol Police, issued a statement saying the worker was arrested on suspicion of endangering safety by use of a dangerous weapon on Thursday. District Attorney Ismael Ozanne says he has to review the case before making a charging decision.

DOA has placed the worker on paid leave until the agency concludes an internal investigation.

Protesters demonstrating against Gov. Scott Walker's collective bargaining law have been bringing balloons to a daily sing-along in the Capitol rotunda. One of them claims the worker popped her balloon and threw her into a door following Monday's sing-along.