The first incident happened late on Thursday in Anitha village in Bhojpur district. After consuming the liquor, the villagers started complaining of stomach pain and began vomiting.
Bhojpur Superintendent of police MR Nayak said that 16 people were arrested in this connection. "More arrest will take place as police raids are going on," he said.
District Magistrate Pratima S Verma said that a six member committee had been constituted to probe into the incident.
Communist Party of India-Marxist-Leninist (CPI-ML) is protesting the incident and are on a day long strike.
"Workers of the CPI-ML have disrupted rail traffic to ensure their strike against death of 18 people in hooch tragedy," a police official said.