(CNN) — At least 94 people have died and more than 150 have been hospitalized after consuming tainted alcohol in India, officials said.

The victims were said to have consumed unregulated moonshine, known locally as “country-made liquor.”

“We have arrested two people, but we are still investigating their role in the incident,” said Partha Pratim Saikia, a senior official with the police in the Golaghat district in the northeastern state of Assam.

The first cases, reported Thursday evening, indicated most victims were tea garden workers, said Manoj Baruah, an official in Jorhat, the other district where cases were reported.

“It is a case of alcohol poisoning, and it has affected a few tea gardens and villages surrounding them in this district,” Saikia said.

People are still arriving at Jorhat hospital for treatment, with extra medical staff called in to help handle patients, Baruah told CNN.

“Doctors from nearby districts and other medical colleges have been rushed in to deal with the crisis,” Assam Health Minister Himanta Biswa Sarma said, Reuters reported.

Illicit booze is cheaper but can kill

The incident is the latest in India’s long battle to control fake or illegal alcohol, which is affordable and readily available to many impoverished people.

Eighty people died in February in Uttar Pradesh and Uttarakhand states after drinking illegal homemade brew. Eight people were arrested as part of a police investigation into that poisoning, and about 400 liters (105 gallons) of illicit booze was seized.

More than 100 people died from drinking illegal moonshine in 2015 in a Mumbai slum, while the deadliest incident was in 2011, when a batch of country-made liquor killed at least 168 people in the state of West Bengal.

Homemade alcohol is typically brewed in villages before being smuggled into cities, where it sells for about 10 cents a glass — about a third the price of legally brewed liquor.

Illegal liquor can be deadly “when other liquids like rubbing alcohol or methanol are added to the distilled spirit,” enabling sellers to increase the amount of liquid and its potential potency, according to SafeProof, a group that lobbies against counterfeit alcohol.

Country-made liquor often contains toxic methanol, which can make people feel inebriated. However, even a very small amount can be toxic. Methanol poisoning can cause confusion, dizziness, drowsiness, headaches and the inability to coordinate muscle movements.