SAN FRANCISCO — An inquiry by the United States Department of Justice into Uber’s use of a program to deceive some regulators has expanded.

The ride-hailing company has been under scrutiny from the Justice Department over a tool called Greyball, which The New York Times reported on in March. The Greyball tool allowed Uber to deploy what was essentially a fake version of its app to evade law enforcement agencies that were trying to clamp down on its service in cities including Portland, Ore., Boston and Las Vegas.

The Justice Department earlier opened an inquiry into Uber’s use of Greyball in Portland, city officials there disclosed in a transportation audit last week. Portland was also moving ahead with subpoenaing Uber on Greyball, an official there said on Friday, affirming that the federal action was a criminal investigation.

Now the inquiry has widened to include Philadelphia. The Philadelphia Parking Authority, a state-governed transportation agency, said on Friday that it was contacted by the Justice Department and asked to hand over information regarding Uber and its use of special software to enter and operate in certain markets.