Service was temporarily suspended on a portion of the Blue Line on Chicago's West Side around 6 p.m. Saturday due to police activity, according to the CTA.
Trains were standing around 6 p.m., according to the CTA, who tweeted at 6:20 p.m. that service was suspended between the Cicero and Kedzie stops, and shuttles would be provided.
Travelers were advised to use the 126 bus as an alternate route.
Officers were investigating an unattended package near the Pulaski Blue Line station, the Chicago Police Department said.
Just after 6:30 p.m., trains began to move again with residual delays.
Check back for updates on this developing story.