BOSTON -- More than 150 people were arrested and 54 kilos of cocaine was seized during a month-long drug sweep in Essex Count, law enforcement officials said Monday.

The sweep focused primarily on Lawrence, Lynn, Methuen and Haverhill and netted 156 arrests, the seizure of more than 54 kilos of cocaine, 138 grams of heroin, 4 to 7 pounds of marijuana and six firearms. The cocaine itself has an ultimate street value of $5.4 million, officials said.

Officials said some of the more significant arrests included: a Swampscott business owner allegedly selling OxyContin and marijuana from his convenience store at 205 Burrill St.; North Andover police seized a handgun and 54 kilos of cocaine and arrested seven people; six people were arrested in Haverhill and southern New Hampshire on cocaine and weapons charges; Juan Lara, 34, was arrested and charged with heroin distribution; Lynn police arrested Handy Iraola on a probation violation and found him to be in possession of a loaded .45 caliber handgun; and Rod Perez, 37, was arrested in Lawrence and charged with trafficking in heroin and a school zone violation.

The sweep was coordinated by Massachusetts State Police Lt. Alan Zani, commander of the Essex County Drug Task Force assigned to the Office of District Attorney Jonathan W. Blodgett. Detectives from each of those cities were joined by members of the Drug Enforcement Agency, Bureau of Alcohol Tobacco Firearms and Explosives, US Immigration and Customs Enforcement, the FBI Gang Unit, Massachusetts State Police Gang Unit, and the State Police Troop A Community Action Team.