No injuries were reported in a fire at a vacant building in Colorado Springs Sunday morning, officials say.

The fire department says fire crews responded around 10:15 a.m. to E. Platte Avenue near Iowa Avenue after receiving multiple 911 calls about smoke coming from a building.

A drone from the Real Time Crime Center was deployed and arrived within two minutes to help firefighters assess the fire before they got there. Firefighters requested more crews to help.

Firefighters went inside but pulled out when the roof started collapsing. They say about two-thirds of the roof collapsed. Some exterior walls also collapsed onto trees and vacant cottages nearby. The buildings involved were all vacant and boarded up, and no one has been reported injured.

The fire was in a building near The Black Sheep music venue, but officials said it was not damaged.

E. Platte Avenue shut down in both directions between Swope Avenue and E. Boulder Street. People were asked to avoid the area while crews investigate at the scene. The closure is expected to last about a few hours into the afternoon.

It's unclear at this time what caused the fire. Authorities are investigating and expect to know the cause later this week.

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