CHICAGO (AP) — Four people were stabbed on a Chicago Transit Authority train early Friday after six men followed another man onto a train and attacked him before he pulled a knife and fought back, police said.

Chicago police said the 42-year-old man was getting on a Red Line train at the North/Clybourn station at about 2 a.m. when six robbery suspects followed him onto the train, demanded his belongings and attacked him with a knife and a broken glass bottle.

The man, who pulled out his own knife and fought back, suffered several stab wounds and was hospitalized in serious condition, police said.

Three of the six suspects were also hospitalized. Police said a 52-year-old man was in serious condition with a stab wound to the neck, a 36-year-old man was in fair condition with cuts to his arm, and a 24-year-old man was stabilized after suffering a stab wound to the back.

The three other attackers were taken into custody, police said.

Chicago fire officials said a CTA employee was also taken to a hospital suffering from anxiety.

CTA was assisting the Chicago Police Department in its investigation, including sharing video from security cameras.

“This kind of violence is absolutely unacceptable, and we applaud the Chicago Police Department for its quick actions to arrest the suspects,” CTA said in a statement

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