The Minnesota Vikings are reporting that 12 members or their organization have tested positive for COVID-19, including eight players, one coach, and three staff members -- but the test results are being called into question.

The NFL revealed today that several positive COVID-19 tests were found a day earlier by one of its testing partners. Among teams reporting false positives, the Vikings, the New York Jets and the Chicago Bears.

The league has asked the New Jersey lab BioReference to investigate the results “while the clubs work to confirm or rule out the positive tests.”

The NFL did not identify the teams or say how many tests were positive. Other teams that were affected are the Buffalo Bills, Pittsburgh Steelers, Philadelphia Eagles and Cleveland Browns.

The NFL uses BioReference for all of its COVID-19 testing, though tests are handled by labs throughout the nation to ensure teams get results quickly.

All Vikings team members that tested positive are currently quarantined as a precautionary measure.

The Vikings are set to open the regulars season three weeks from today, on Sunday, September 13th, against the Green Bay Packers at U.S. Bank Stadium.