New Jersey’s attorney general sued four Pennsylvania companies and a Virginia firm Monday, accusing them of advertising and selling fireworks for illegal use in New Jersey. “These companies misled New Jersey citizens into believing that they could legally transport, possess and display fireworks in New Jersey,” said Attorney General Zulima Farber. The lawsuits, filed in Superior Court in Mercer County, accuse Keystone Fireworks, Phantom Fireworks, Spartan Fireworks and Sky King Fireworks, all based in Pennsylvania, and Virginia-based Discount Fireworks of violating New Jersey’s Consumer Fraud Act. It is illegal for anyone to possess, use or sell fireworks in New Jersey without a valid permit. State investigators say they made an undercover purchase earlier this month of more than $500 worth of explosives from Discount Fireworks. The company arranged to ship the fireworks, with names like “Armageddon” and “Goliath,” to New Jersey on June 20, authorities said. The state also charged two of the Pennsylvania companies, Sky King and Phantom, with advertising fireworks on outdoor billboards in New Jersey. A woman who answered the phone at Sky King’s Morrisville, Pa., store said no one could comment on the lawsuits Monday afternoon. “We’re really busy,” she said. The companies could face tens of thousands of dollars in fines if found guilty.