The U.S. has been importing about three million parcels a day with little customs inspection, raising concerns about the ease of sending fentanyl.

The U.S. Postal Service said it would temporarily suspend international parcels from China and Hong Kong, cutting off a service that is popular with online vendors in China. The announcement said the inbound service was suspended until further notice and that the change wouldn’t affect delivery of letters.

The U.S. Postal Service will temporarily suspend accepting inbound parcels from China and Hong Kong Posts until further notice, the USPS website showed. The change, effective from Feb. 4, will not impact the flow of letters and 'flats' from China and Hong Kong,