PHILADELPHIA – Philadelphia's plan to test and license tour guides is on hold.

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

Mayor Michael Nutter signed the law in April amid concerns that some guides were telling Philadelphia's history inaccurately. 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.