Federal authorities announced Wednesday that they are suing a nonprofit organization that wants to build a facility in Philadelphia where drug users could inject heroin and illicit fentanyl under medical supervision to be protected from overdosing.

The lawsuit, filed Tuesday against the nonprofit Safehouse and its executive director Jen Bowles, is the first of its kind. The lawsuit could set a precedent on whether other cities can set up similar facilities, known as supervised injection sites. Seattle, Denver, Pittsburgh, San Francisco, and New York have considered them.