The firefighter, 25, was killed after emergency responders were called to a building in the McCully-Moiliili neighborhood of Honolulu before 8 p.m., fire officials said in a news conference Monday evening. The cause of the blaze was unclear, and officials said they were still investigating.

Honolulu's fire chief said firefighter Jeffrey Fiala, who was trapped by a roof collapse, had been with the department for less than two years.

Four other firefighters and one civilian were injured in the fire and transported to Honolulu area hospitals, where they continue to recover.