As coronavirus sparks a global run on medical supplies, criminals are moving in.

Hospitals from Italy to Japan have reported disappearing inventories of newly precious masks and hand sanitizer. Authorities in Ukraine, Taiwan and elsewhere have broken up efforts to smuggle such goods across borders. Authorities in the U.S. and elsewhere also report frauds in which people are tricked into buying nonexistent medical supplies or providing financial information to criminals posing as health workers.

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