MADISON, Wis. — Police have arrested more protesters in the Wisconsin Capitol.

Protesters have been singing songs against Republican Gov. Scott Walker in the Capitol rotunda almost every noon hour for more than two years. Police began a crackdown on them on July 24 for lacking a permit.

The protesters maintain they don't need a permit because they're exercising their free speech rights. They also say the permit requires applicants to assume responsibility for any damage to the building but since they're not an organized group no one can officially assume liability.

Officers have issued more than 175 tickets over the last two weeks. State Department of Administration officials say police issued another 18 citations on Thursday, including one for disorderly conduct.