(TheDrinksBusiness) - Seven workers have been killed in Mexico City while cleaning a beer tank at the Grupo Modelo brewery, where Corona beer is brewed. Authorities in Mexico City confirmed that the seven died in the tank and that investigations are underway to find the cause of death. Early reports are suggesting that the workers may have died from toxic fumes.

Jennifer Shelley, a spokeswoman for Grupo Modelo, told local media that the deaths occurred on Sunday morning. She said: “Early in the morning of April 7, we had an accident at Cervecería Modelo in Mexico City, which occurred in a confined area in a tank in which cleaning and upkeep works were being done. Unfortunately the accident resulted in seven deaths.”

In a statement the company said: “Modelo is deeply sorry for this incident and will support the affected families permanently.”