BRIDGEPORT, Conn. (AP) Four days after a massive fire leveled a Bridgeport factory, firefighters were extinguishing remaining hot spots.

The Connecticut Post reports that Deputy Fire Chief Dominick Carfi said 99 percent of the hot spots had been put out by Monday. He said some collapsed areas are still difficult to reach.

The investigation has not begun because officials must make sure the property is cold.

Environmental officials believe a chemical that washed into the Pequonnock River, Bridgeport Harbor and Long Island Sound was a dye.

A state ban on commercial shellfishing in Long Island Sound from Milford to Norwalk has been reduced to Bridgeport, Fairfield and Stratford.

State aquaculture officials have begun collecting oysters and clams off Bridgeport to be inspected for semi-volatile and volatile organic compounds and heavy metals.