The Freedom Tower

New York prosecutors are investigating whether a firm that tested concrete foundations at the future Yankee Stadium and the World Trade Center’s signature new tower falsified test results or billed for tests never done, a law enforcement official said Friday.

Newsday, the Long Island newspaper, says investigators executed search warrants Friday at Testwell Laboratories Inc. offices in Queens, suburban Ossining in upstate New York and at Yankee Stadium, an official familiar with the investigation told The Associated Press. The official spoke on condition of anonymity because the investigation had not previously been made public.

Prosecutors are exploring whether Testwell falsified some test results, double- and triple-billed for some tests and charged clients for tests the firm never conducted, the official told the AP.

The $1.3 billion new Yankee Stadium _ being built across the street from the team’s former home in the Bronx _ is a focus of the probe, as is the Freedom Tower, the 102-story skyscraper being built to replace the destroyed trade center at ground zero, the official said. Up to a dozen other projects also may be involved, the official said.