Eight people were arrested in Green Cove Springs Friday as part of a year-long investigation into illegal narcotics sales.

Operation Clean Streets was a joint effort by the city police department, as well as the Clay County Sheriff's Office, U.S. Drug Enforcement Administration, U.S. Department of Alcohol Tobacco and Firearms, Florida Department of Law Enforcement, State Fire Marshal's Office and the Orange Park Police Department, said a statement by Green Cove Springs Police Chief Robert Musco.

At 6 p.m., officers simultaneously executed five residential search warrants at residences in Green Cove Springs that had been the scene of "numerous narcotics cases," the statement said. The warrants were for two residences on Idlewild Avenue and one each on Palm Street, Love Drive and South Vermont Avenue.

Arrested were Thomas Birley, 43; Mary Riesenberg, 42; Elijua Tobler, 52; Paulette Tobler, 46; Antashon Cunningham, 29; Marvin Brown, 21; Louis Thornton, 24; and Jacquelin Tobler, 46. The statement did not say whether all of the people arrested were Green Cove Springs residents.

Also, crack and powder cocaine, marijuana, drug manufacturing equipment, drug paraphernalia, two handguns and a vehicle were seized, the statement said.