PORT WENTWORTH, Ga. (AP) — Specialists arrived Tuesday to help extinguish a 5-day-old sugar-refinery fire burning too intensely and deeply for standard firefighting to douse, and officials feared the deadly blaze could once again trigger explosions.

Thick masses of molten sugar were smoldering at temperatures as high as 4,000 degrees and three more fires ignited Tuesday, even after a helicopter dumped thousands of gallons on the fire.

"We're dealing with a dormant volcano full of lava," said Capt. Matt Stanley from the fire department in nearby Savannah.

Six people are confirmed dead in Thursday's fire, and two other workers remained missing Tuesday.