The Trump administration’s use of federal troops in Los Angeles to conduct law enforcement operations is unlawful, a federal judge ruled on Tuesday.

U.S. District Judge Charles Breyer issued an order prohibiting troops from engaging in security patrols, riot control, arrests, searches and crowd control. The order does not take effect until Sept. 12 to allow the Trump administration to appeal.

Breyer said the use of federal troops effectively created a “national police force with the president as its chief” and violated the Posse Comitatus Act.

“The evidence at trial established that Defendants systematically used armed soldiers (whose identity was often obscured by protective armor) and military vehicles to set up protective perimeters and traffic blockades, engage in crowd control, and otherwise demonstrate a military presence in and around Los Angeles. In short, Defendants violated the Posse Comitatus Act,” Breyer wrote.

This is a developing story. Please check back for updates.