METHUEN, MASS. (WHDH) - Police in Methuen have arrested a man who was allegedly in possession of 15 kilos of fentanyl–worth approximately $1.2 mil.

Officials responded to a 911 call on Monday, reporting a man with a gun in a taxi on Glen Avenue in Methuen.

The caller gave a detailed description of the man who allegedly exited the taxi, retrieved a gun from a duffel bag and concealed it before re-entering the vehicle.

Officers were able to locate the man matching the 911 caller’s description sitting in the backseat of a taxi with a duffel bag on the floor next to him.

Police arrested Robinson Rojas-Rosario, 32 of Queens, NY.

An initial investigation led to the discovery of fentanyl, worth approximately $1.2 mil.

The arrest comes just days after a 10-month-old baby was exposed to fentanyl and hospitalized.

Rojas-Rosario is being held on $100,000 bail at the Methuen Police station.

He is expected to be arraigned at Lawrence District court.

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