Two people died in a fire that investigators believe was intentionally set at a Kansas City, Missouri, apartment complex early Monday, authorities said.

Witnesses heard a loud boom and smoke detectors going off at a three-story apartment building at the Vivion Oaks Apartments, they told FOX4 Kansas City.

Kansas City firefighters responded and battled the flames.

The building sustained serious damage and appeared destroyed, KCTV5 reported. One woman suffered minor burns to her arms and was treated at the scene. 

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While clearing the building after the fire was extinguished, the station reported that firefighters discovered the bodies of two people. 

Fire burning at apartment building

Two people died in a fire that investigators believe was intentionally set at an apartment complex in Kansas City Missouri, early Monday. (FOX4 Kansas City WDAF)

Investigators said the burn pattern from the first floor to the third floor, along with how fast the fire spread, leads them to believe the blaze was wet on purpose, the FOX4 reported.

Firefighters battling apartment fire

Investigators believe the fire was intentionally set after examining the burn pattern and how quickly the fire spread, FOX4 reported. (FOX4 Kansas City WDAF)

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The fire is under investigation by Bureau of Alcohol, Tobacco and Firearms agents, Kansas City police and fire officials.

Authorities asked anyone with information about the fire to call the TIPS Hotline at 816-474-TIPS.