#0921WF1 UPDATE second alarm fire 2 occupants displaced dentist office evacuated pic.twitter.com/aJoXXwTneg — San Francisco Fire (@sffdpio) September 21, 2016

In #SF and wondering where that large plume of smoke is coming from? Crews are battling a fire in #PotreroHill: https://t.co/U2JKLMUMSS pic.twitter.com/KgjDpBeUfC — ABC7 News (@abc7newsbayarea) September 21, 2016

Here's a look at timelapse video from our tower camera of the two-alarm fire burning in #SF's #PotreroHill: https://t.co/7WjPY9g5FW pic.twitter.com/v8R1cZJ7iC — ABC7 News (@abc7newsbayarea) September 21, 2016

HAPPENING NOW: Crews battling a fire in Potrero Hill neighborhood. pic.twitter.com/P7iRzJcEZS — Lyanne Melendez (@LyanneMelendez) September 21, 2016

@abc7newsbayarea Just spotted a fire in Potrero Hill from 280, do you have any information? pic.twitter.com/tc2MpRNO84 — Rahul Sharodi 🇺🇸 (@RSharodi) September 21, 2016

SAN FRANCISCO (KGO) -- Heavy smoke poured from an apartment complex in San Francisco due to a two-alarm fire in the Potrero Hill neighborhood.The fire broke out Wednesday after 2 p.m. at 19th Street and Vermont and firefighters were able to get the fire under control.The two-story mixed use building that caught fire had offices on the lower levels and a single home at the top. The owner of the home was not home at the time of the fire.People inside a dental office on the bottom level were quickly evacuated."Around 2:40, 2:45 this afternoon we received multiple phone calls for a fire around the area of 19th and Vermont. First arriving crews visualized a fire on the roof at 2210 19th Street," said San Francisco Fire Department spokesman Jonathan Baxter.The owner of the home had gun powder in his residence, so he alerted firefighters of the potential danger.The fire occurred across the street from a high school. There were few students inside because it was a shortened day, but the few who were there were told to shelter in place.No injuries were reported. The cause of the fire is still under investigation.