HOUSTON -

Authorities are investigating what caused a fire to start at a high-rise building still under construction in Montrose.

Firefighters were called to the building on Alabama near Dunlavy just before 9 p.m. Thursday.

Neighbors reported seeing smoke coming from the fifth floor and called 911.

Houston firefighters used a ladder truck to get to the fire and quickly put out the flames.

An arson unit is investigating the fire.