As more Americans are required to wear masks during the ongoing coronavirus pandemic, authorities have warned that counterfeit N95 masks are flooding the market.

Over the last several weeks, there have been reports of hospitals and first responders in New Jersey , West Virginia , Missouri and elsewhere that purchased faulty face masks.

On Thursday, the Food and Drug Administration reduced the number of approved Chinese N95-style mask producers, because many masks imported from China did not meet U.S. safety standards, the Wall Street Journal reported.