(SHANGHAI) — China’s top drug safety agency has ordered its local bureaus to increase supervision over the production of heparin, a blood-thinning drug that has been linked to at least 19 deaths and hundreds of allergic reactions in the United States, China’s state-run news agency reported Friday. The drug agency, the State Food and Drug Administration, said producers of the active ingredient in heparin must now obtain their raw material from registered suppliers, and it ordered the suppliers to strengthen their checks on the quality and safety of those raw ingredients. The announcement, just hours after American officials said they...