A passing motorist agreed to drive the men to a hospital, but both victims got out of the car at Belmont and Halsted when they saw police officers who were working on an unrelated matter. The driver then left the scene, police said.
Police said the friend was unfamiliar with the area and he could only estimate that the stabbing took place near Broadway and Montrose. The stabbing victim was unable to immediately speak with officers.
According to the friend, both robbers were black men. One of them had dreadlocks and wore black shorts and a black shirt with a square shape on the front.