(Philadelphia - AP) Philadelphia's plan to test and license tour guides has been put on hold - for now.

Lawyers for three tour guides who challenged the plan say a federal judge on Monday temporarily blocked the city from enforcing the testing law. The ordinance was scheduled to take effect next Monday.

Mayor Michael Nutter signed the law in April amid concerns some guides were perpetuating gross inaccuracies in Philadelphia's history. The three guides say it violates their free speech rights.

The guides' lawyers say the judge's order prevents the law from being enforced for six months, or until the litigation is resolved.