Eight people were arrested on drug trafficking charges yesterday in a police sweep, according to authorities.

Arrested were:

Mario Lopez, 30, of 77 Hobbs Ave., sale of cocaine and sale of heroin, second offense;

Lawrence Nelson, 23, of 19 Buck St., one count of the sale of cocaine;

Gilberto Alvarez, 65, of 40 Ash St., Apt. 1, five counts of sale of cocaine;

Andrea Lozupone, 25, of 96 Conant Road, sale of OxyContin, second offense;

Grace Ledgister, 49, of 20 Hanover St., one count each of sale of morphine and Clonazepam, second offense;

Dana Hastings, 20, no fixed address, sale of Clonazepam;

Jennifer Dorval, 28, of 94 Chandler St., Apt. C, one count of sale of Clonazepam;

Katie Dube, 23, of 16 Central St., sale of cocaine, two counts, and sale of crack cocaine.

Police said all were arrested without incident and were arraigned today in Nashua District Court.