Federal agents tasked with investigating coronavirus-related imports have disrupted more than $17 million in transactions for prohibited or counterfeit medical items they say could have harmed the public.

Homeland Security Investigations, an office within the Department of Homeland Security’s Immigration and Customs Enforcement, announced Tuesday in a Senate hearing that just over 900 foreign shipments have been blocked from entering the United States as part of Operation Stolen Promise. The operation was launched 100 days ago in an effort to go after transnational criminals trying to profit from selling bogus or illegitimate personal protective equipment and pharmaceuticals amid the coronavirus pandemic.