concerning

Uncertainty concerning tariff levels has also weighed on manufacturers, as duty levels have fluctuated for much of the year.

It added it took any allegation concerning worker welfare and safety extremely seriously, and would not "tolerate intimidation or threats against workers for exercising their rights, including participation in industrial action".

What makes these allegations particularly concerning is that, if accurate, they’d amount to an established firm erecting barriers to entry to a smaller competitor—classic anticompetitive behavior.

The most concerning violations were linked to barium.

The agency didn’t say what the investigation was concerning.