PHILADELPHIA (WPVI) -- A Center City apartment complex was evacuated Tuesday night after a fire broke out. A viewer sent Action News images of smoke pouring from the Adelphia House Apartments on the 1200 block of Chestnut Street. The fire started in a 4th-floor apartment, according to firefighters.

Smoke could be seen coming from a burning Center City high-rise apartment in Philadelphia overnight as residents streamed out onto the sidewalk below.

"The Star building that is becoming the Patmos Center will be the technological heart of the heartland," John Johnson, founder and CEO, said in a press release. "Patmos was born in Kansas City, and we couldn’t be more thrilled to establish our new hub right here in the Silicon Prairie."

Some residents were trapped on the roof as they tried to escape the smoke. They were eventually rescued by fire crews.