Police say more than 20 people have been arrested in eastern Connecticut in connection with a three-month narcotics investigation.

Willimantic Police Corporal Stanley F. Parizo Jr. said Monday that 23 people have been arrested in the last two weeks. He says police seized more than $5,000 in cash and varying amounts of cocaine, heroin and K2, a synthetic marijuana substance.

Police say they staggered the arrests to avoid drawing attention to the investigation, which they dubbed “Operation Thread City Round Up.”

Most of the people arrested are facing heroin or cocaine possession and sales charges.

Police say they are still working to secure arrest warrants.

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