A shooting on a CTA Red Line train halted service on the city's North Side on Wednesday morning.
The CTA first reported a disturbance at 8:46 a.m. on a northbound Red Line train between the Bryn Mawr and Thorndale station in Edgewater.
A 23-year-old woman approached a 33-year-old man while on the train and allegedly spat at him, which sparked an argument. Witnesses on the train said that's when she pulled out a gun and shot him.
"It was pretty scary. I had left the train right before it happened and got to school and heard about it and it was just like really scary," said rider Kaeley Hernandez.
The man was struck in his left shoulder, according to Chicago police. Other riders on the train were quickly rushed off at the Argyle station.
Power was temporarily cut to the line until police could safely move the train to the Thorndale stop, where the victim was given medical treatment by paramedics.
"I feel like they should be like security at each station. Every time the train stops there should be security guards there and at least one security guard present on the train at all times," said Abdullah Quraishi, rider.
The woman was taken into custody and a firearm was recovered, according to police.
SEE ALSO: Conviction vacated for last jailed defendant in 2011 murder of Chicago police Officer Clifton Lewis
It's unclear if the CTA's security cameras helped locate the suspect or if the transit agency's new Zero Eyes 24/7 gun detection system, which has been installed at certain train platforms, were in use at the time of the incident.
At last check the victim was taken to the hospital and was expected to be OK.
Trains were halted near Argyle and Broadway in Uptown for about one hour, according to the transit agency. CTA said Red Line trains resumed making stops at Thorndale at 9:53 a.m.
Alderwoman Leni Manaa-Hoppenworth, with the 48th Ward, released a statement saying in part, "I am outraged by the gun violence that we saw today in our community...The bottom line is we need to get these guns off the streets...We need CTA leadership to present a plan to increase safety on our trains and ultimately rebuild trust with riders."
Originally, the CTA said the incident happened on a train departing from the Argyle station.
INTERACTIVE SAFETY TRACKER | Track crime and safety in your neighborhood