A worker with the Arizona Public Service (APS) worker is killed after an explosion sent flames shooting out of a manhole in downtown Phoenix Sunday night.

[STORY: APS worker dead after underground fire in downtown Phoenix]

The incident occurred just after 10:30 p.m. at an APS underground electrical vault near the area of First Avenue and Washington Street.

[MAP: Downtown Phoenix buildings without power due to fire]

APS told firefighters that they had two workers down in the vault when the fire occurred.

[VIDEO: APS worker dead following underground fire in downtown Phoenix]

According to Phoenix fire, one of the workers was able to get out of the vault and suffered burn injuries to his hands and face. He was transported to Maricopa Medical Burn Center in stable condition.

Once firefighters extinguished the fire, they were able to confirm that the other worker was dead.