Trains on the Orange Line were standing near the Kedzie stop on Chicago's Southwest Side due to police activity Sunday afternoon, according to the CTA.
Trains were halted around 2:15 p.m., the CTA tweeted. Just after 2:30 p.m., the agency tweeted that trains began running again with residual delays.
The Chicago Police Department could not immediately confirm the police activity.
Check back for updates on this developing story.