All three sites raided were tied to a drug cartel in Sinaloa. Mexican marines had intelligence that fentanyl precursors were being imported from a Hong Kong based company. Marines then traced a shipment of containers that departed from a Japanese port to the seaport of Ensenada, per the AP. An undisclosed amount of three precursor chemicals were found in the containers.
https://dailycaller.com/2020/10/26/mexico-city-meth-fentanyl-lab-seized-drug-cartel-operation/