CHICAGO (CBS) — A 34-year-old man was stabbed on a Blue Line train Monday morning on the Near West Side, leading to some delays on the CTA during the morning rush.

Police said the victim got into an argument with another man while riding an inbound Blue Line train around 7:20 a.m. as the train was approaching the Racine stop, when the other man stabbed him in the stomach.

The victim was taken to Stroger Hospital for treatment, but police said his wounds were superficial.

The suspect got away, but the police investigation at the Racine stop on the Blue Line prompted the CTA to operate Blue Line trains headed in both directions on a single track, causing delays for nearly half an hour until normal service resumed around 8 a.m.

Although the victim’s wounds were not serious, the attack had some fellow Blue Line riders worried about their safety.

“You hear the CTA doing a lot about adding more cameras, and more police presence, but it just seems like the crime continues on; and, in some cases, it’s getting more and more brazen and more and more violent,” Owen Young said.

Area Central detectives were investigating the stabbing. No one was in custody Monday morning.

CTA officials said they were working with police to review any surveillance video footage of the stabbing.