CHICAGO (WBBM NEWSRADIO) -- Police are investigating two separate attacks, where four people were stabbed hours apart Thursday night and early Friday in the Loop.
The first stabbing occurred around 9:15 p.m. Thursday during a robbery at a CTA Red Line station at Jackson.
Police said two men, one armed with a knife, demanding a 29-year-old man's backpack and watch, while he stood on the platform in the 200 block of South State Street.
Although he complied, police said the man was stabbed in the back of the ear.
While the attackers were running away, two other people, both males, were stabbed, police said. One of the victims was taken to Northwestern Memorial Hospital, where he was listed in fair condition with a head wound, police said.
The 29-year-old man was also taken to Northwestern, where he was also in fair condition, police said.
The third person stabbed refused treatment, authorities said.
None of their wounds were considered life-threatening.
Several hours later, another stabbing occurred with another 29-year-old man as the victim.
The 29-year-old man began arguing with someone on the platform at the Blue Line station at Washington in the first block of North Dearborn Street when he was stabbed with a pair of scissors, police said.
The victim was taken to Northwestern in fair condition, police said.
No one was in custody for either attack. The CTA stations are well covered by surveillance cameras, police said.