Loop, downtown Chicago bomb scare

Chicago police are investigating a suspicious package left at a downtown high rise, that caused evacuations and major delays on CTA's Red and Blue lines.

The tube-shaped device at the center of the commotion was discovered at the Citadel Center building at 131 South Dearborn Street, around 3:45 p.m.

As a precautionary measure, several floors in the 37-story office building were evacuated.

In additional to service delays on the Red and Blue lines, according to ABC News, the following CTA buses have been rerouted: #1, #7, #28, #36, #22, #24, #121, #123, #110, and the #62.

As of 8 p.m., officials determined the device, which was wrapped in paper, is not a threat.

Street traffic and CTA services are slowly returning to normal.