Lowell police, the FBI, and other police departments joined Tuesday night in a prostitution sweep that led to the arrest of 18 suspects, authorities said today. The operation, the third this summer, was conducted on Middlesex, Westford, and Gorham streets in Lowell from 5 p.m. to 10 p.m. along with the help of the FBI, Massachusetts State Police, amd the Methuen and Lawrence police departments, Lowell Police Superintendent Kenneth Lavallee said.
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