In a part of India where the sale, manufacture and consumption of liquor is against the law, at least 28 people died and 60 others got sick after drinking liquor that had a poisonous chemical added to it.

Officials in the Gujarat state are still unaware of what chemical was added to the liquor. Investigators are detaining suspected bootleggers of the spiked alcohol.

Deaths from illegal “hooch” alcohol are not uncommon in India. Pesticides and other chemicals have been found in the cheap liquor and are used to increase the potency.