A one-alarm fire in a Ferry Building vent spread to the structure's roof this morning, sending San Francisco Fire Department crews to the scene to battle the small yet smoky blaze.

According to the San Francisco Fire Department, 911 started receiving calls reporting the rooftop smoke at around 7:25 this morning.

Firefighters quickly realized that the cause of the smoke was a vent fire that extended to the roof, causing the roof area around the vent to burn, the SFFD says. By 7:58, the fire had been controlled.

No injuries were reported, nor was anyone displaced in the incident. According to Chron reporter Evan Sernoffsky, the building was evacuated "while fire crews mop up."

According to the SFFD, "crews will remain on scene to clean up and do overhaul of burnt material" this morning, which will likely make for delays on the Embarcadero. If you can, it's recommended that you avoid the area.