The one in Taiwan burned down on 23 Dec 2020. On the 10 May 2020 a plant in Illinois, and one in Garcia Mexico both were on fire and produced magnesium which is used in HCQ. link: https://www.sgtreport.com/2020/12/pharmaceutical-factory-that-manufactures-hydroxychloroquine-mysteriously-bursts-into-flames-explodes/ link: https://www.oom2.com/t69648-large-fire-at-magnesium-factory-in-madison-illinois Then there is a story which says both are debunked: https://www.reuters.com/article/uk-factcheck-factories-fire-magnesium-idUSKBN22U2C9

So Taiwan for sure and ??? on others.

The one in Taiwan burned down on 23 Dec 2020. On the 10 May 2020 a plant in Illinois, and one in Garcia Mexico both were on fire and produced magnesium which is used in HCQ.