LAWRENCE, MASS. (WHDH) - Four Lawrence men are facing drug trafficking charges after authorities say a large quantity of fentanyl was seized during a massive bust early Wednesday morning.

Troopers assigned to the Commonwealth Interstate Narcotics Reduction Enforcement Team identified drug runners, accomplices, and a possible stash house at 10 Kempton Court during a monthslong investigation, according to Massachusetts State Police.

After setting up surveillance in the area, investigators are said to have observed a drug transaction, which resulted in a motor vehicle stop and a pair of arrests.

A search warrant was then executed at the suspected stash house. A third suspect was taken into custody after 750 grams of fentanyl, several finger presses, and $1,060 were seized, police said.

A fourth suspect was taken into custody at a separate location.

Alex Martinez, 32, Jean Carlos Marte-Velasquez, 27, Genesis Fernandez, 26, and Servino Perez-Guzman, 29, were all arraigned Wednesday on trafficking charges in Lawrence District Court.

Martinez, Velasquez, and Guzman are being held on $250,000 bail. Fernandez is being held on $35,000 bail.

A probable cause hearing has been set for April 3.

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