Smoke billowing from the building was the first sign of trouble.
"All the sudden I hear him, ‘Fire, there's a fire,’” said Sarah Serrato. "I don't hear a fire alarm going off. I don't see everyone running out."
So Serrato and Gregory Robbins ran in; knocking on the doors and windows of all 30 apartments in the building.
Robbins told ABC 4 Utah, "I ran up every flight. By the time I got to the third floor I got back to the second floor and I couldn't even see my way out of the door."
Serrato said "I'm banging on everyone's door ‘get out fire!’"
Robbins finds the apartment where he believes the fire started. "I popped the door open, the smoke came out and the door shut back on me. It was a wall of black smoke and that's when the fire alarms go off."
Robbins fears there's a mother and her two children inside the apartment, but he can't get in so he runs to knock on other apartment doors. "They were looking at me like I was absolutely crazy, but I was like 'do you not smell the smoke? Get out of here man, you guys have got kids. Go!'"
Meanwhile, Serrato is doing the same.
"Some of the windows are open,” said Serrato. “I’m opening the blinds making sure I don't see a baby. You know, I would have went in."
Neither Serrato, Robbins nor the firefighters find anyone inside.
"It's scaring me because I don't know if the kids are okay, and the lady the fire supposedly started in,” explained Robbins. “I don't know if the kids and stuff are okay."
Salt Lake City Fire Department spokesperson Jasen Asay told ABC 4 Utah, “As far as we've been told everybody was able to get out okay."
That is good news for the good Samaritans, but they're now looking for someone else for answers.
Serrato asks, "Where's the alarm, where's the management right now?”
Robbins said, “When these apartments don't have a fire alarm what are you supposed to do really?"
Again firefighters say when they arrived, and the fire had spread from the second floor to the third and through the roof, there were alarms going off in the building.
Firefighters say many of the 30 apartments in the building were damaged by either fire, smoke or water. As many as 50 residents have been displaced. The Red Cross has been called in to help.