Cheyenne firefighters were called to the Park Lane Apartments at 1717 Alexander shortly before 1:30 p.m. Wednesday afternoon.

"There was a fire on the roof of the structure when they arrived," said City of Cheyenne spokesman Scott Smith. "Firefighters went inside the building and helped evacuate some of the residents who were still in the building at the time of the fire."

Smith says no one was injured in the blaze.

"The cause of the fire is unknown at this time and is under investigation," said Smith.