CHICAGO (CBS) — Red Line trains resumed normal service as the morning rush began Wednesday, after the authorities investigated a suspicious package at the Grand Avenue subway stop.

Police and firefighters were called to the Grand subway stop just after 6 a.m., after a CTA employee reported finding a bag that smelled like gasoline.

Before officers arrived, a civilian had removed the bag, but the station was closed while police and fire officials investigated.

Red Line trains initially were re-routed to the elevated tracks between Fullerton and Cermak-Chinatown, but later resumed service in the subway, bypassing the Grand and State stop while the CTA and Chicago Fire Department investigated.

Shortly after 7 a.m., the CTA gave the all-clear, and trains resumed normal service, including stops at Grand.

Police later learned the bag belonged to a homeless person.