Uber is facing a criminal investigation in Philadelphia over its regulation-skirting activity

Uber is under investigation in Philadelphia for Greyball, its software program that showed government officials a fake version of the Uber app to prevent them from monitoring Uber's use in cities where it was skirting regulations.

The ride-hailing giant was already under investigation in Portland, Ore., for the same scheme. Uber's use of Greyball was first reported by the New York Times in early March. The software uses data to identify government officials who are using the Uber app to try to enforce transportation regulations.

"The PPA is cooperating with federal law enforcement officials and providing all of the information that they have regarding this software program," Philadelphia Parking Authority spokesman Martin O'Rourke told the local site Newsworks.

A transportation audit by the City of Portland last week revealed the federal inquiry. According to Reuters, that inquiry is a criminal investigation by the Department of Justice.

The Philadelphia Parking Authority confirmed to Newsworks that the investigation had extended to Philadelphia.

Uber spent a chunk of last year in legal limbo in Philadelphia. An agreement to temporarily legalize ride-hailing in the city expired in early October. The next agreement to fully legalize ride-hailing wasn't approved until for another month.

Uber declined to comment on these investigations.

Uber's stellar 2017 continues.