LOWELL – Five individuals were taken into custody in an extensive operation to crack down on drug and firearm trafficking in the city, authorities announced Friday. Middlesex District Attorney Marian Ryan, Lowell Police Superintendent Greg Hudon, and Massachusetts State Police Colonel Geoffrey Noble said Kevin Chou, Vesnar Van, Norath Chou, Jacob Boyce, and Theresa Naill were arrested on allegations of trafficking firearms and cocaine.