At least 133 people have died and more than 200 others have been hospitalized after consuming tainted alcohol in India, officials said.
The victims consumed unregulated moonshine, known locally as "country-made liquor."
Police arrested 10 people and are questioning others suspected of being involved in the supply of liquor in the area, said Mukesh Agarwal, a senior police official in Golaghat district in northeastern Assam state.
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," said Partha Pratim Saikia, a senior police official in Assam.
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.