As the country reels from the tragedy at the Boston Marathon, local transit authorities beefed up security.
Metra and Amtrak each issued security reminders to commuters about extra security measures, and passengers saw the proof for themselves. Uniformed police officers and bomb-sniffing dogs were seen Tuesday morning at Union Station.
"In response to recent events, you may see an increased police presence at Chicago downtown terminals and onboard trains," Metra's website noted. "As always, should you see something you believe unusual or out of the ordinary please notify a conductor or a uniformed Metra police officer."
Amtrak also pointed to additional security and asked train crews, station personnel and commuters to report all suspicious activity by dialing 911 or Amtrak Police at 1-800-331-0008.
"The Amtrak Police Department has stepped up patrols and is conducting increased sweeps of stations, trains and railroad property. APD continues to work with local, state and national law enforcement partners in staffing intelligence centers to share and collect information."
Security was increased in cities across the country after Monday's attacks in Boston. In Chicago, local law enforcement remains vigilant, monitoring the developments in Boston and taking precautionary measures.
"CPD and other first responders, like first responders in other major cities, are monitoring events closely and communicating with law enforcement officials as a precautionary measure," Chicago Police Supt. Garry McCarthy said. "At this time, we are not aware of any threats facing Chicago."
Chicago's Office of Emergency Management and Communications echoed McCarthy, noting the city's public safety departments are actively communicating with local and national law enforcement partners but "are not aware of any additional threats."
Organizers for the Chicago Marathon said the event will go on as planned but organizers will make security adjustments if needed.