One man is in custody and 21 people have been displaced after a fire ripped through a north Phoenix apartment building on Friday morning. Phoenix police responded to the complex near 14th and Vogel avenues around 7:30 a.m. after receiving calls of "unknown trouble" and a possible fire inside one of the units. Witnesses reportedly told responding officers that someone was being held inside one of the apartments against his will. When Phoenix fire units arrived just before 8 a.m., firefighters found flames and smoke coming from a second story window. They were able to stop the fire from spreading to more units, but smoke filled the attic and caused connecting units to become unlivable. As officers began evacuating apartments in the complex, they found two men leaving a second story unit and detained both men for questioning.