In total, 56 people have been affected in two municipalities in the western state since Saturday, state health official Huge Esparza said during a press conference, including the 21 who have died and 29 who have become ill.

The 13 who became seriously ill were transported via helicopter to hospitals in Guadalajara, the capital of Jalisco, while the rest were discharged, Esparza said.

On Saturday, patients began presenting with “symptoms of blurred vision and/or vision loss, intense abdominal pain, difficulty breathing and convulsions,” he said.

They had ingested a form of cane alcohol purer than that made for drinking that was manufactured in neighboring Michoacan state.

Some 700 liters of the liquor were seized over the following days.

Laboratory tests showed the liquor contained a “high concentration” of methanol used “as an additive to liquid fuels,” according to another

Jalisco health official, Denis Santiago

“This chemical agent is for industrial use,” he said.

One other person was affected in Michoacan, though Jalisco authorities did not provide details on their condition.