PARIS -- PSA Group offices were raided by fraud investigators as part of a government probe on pollutants in the automobile sector.
The French Economy Ministry's fraud office said it searched five premises following "anomalies" in emissions tests.
PSA sites in Saint-Ouen, Velizy, La Garenne-Colombes, Carrieres-sous-Poissy and Montbeliard were raided Thursday after irregularities were spotted in the nitrogen-oxide emissions of three diesel vehicles.
"It was unexpected, a total surprise," a PSA spokesman said.
In a statement, the automaker said: "PSA Group confirms compliance of its vehicles in pollutant emissions in all countries where it operates. PSA Group is fully cooperating with the authorities."
French authorities started a probe in September into Volkswagen's emissions-rigging in its diesel cars and expanded the investigation to cover all carmakers. Separately, the country's environmental regulator began randomly testing vehicles to check differences between lab results and real-world emissions.
The industrywide probe is open and ongoing, a spokeswoman for the fraud body said. The fraud authority had said in March that no evidence of cheating had so far been found. It declined on Friday to comment on the status of the investigation.
Gov't commission hearing
The French Environment Ministry this month said that a committee appointed to look into emissions was hearing from carmakers and that tests were to be conducted on 100 vehicles. A ministry commission will hear Gilles Le Borgne, PSA's head of research and development, and Christian Chapelle, the company's head of drivetrains and chassis, on April 28.
In January, shares in Renault fell sharply on news that it had been raided by French regulators. PSA's shares fell to as low as 13.47 euros and traded down 2.7 percent at 13.73 euros as 9:29 a.m. in Paris on Friday.
Volkswagen last year admitted to using software to conceal the level of toxic emissions in 11 million diesel vehicles sold worldwide. The VW case has prompted investigations across several countries into Volkswagen, as well as checks on other car manufacturers and a tightening of emissions regulations that some industry analysts think could hit the entire diesel vehicle industry - a key market for PSA and Renault.
Reuters and Bloomberg contributed to this report