The shot is between 14 and 17 years old, the police in Aurora announce via Twitter.
It is unclear how seriously injured the five are, but all five have been taken to hospital.
The shooting took place in a park next to a high school.
Security measures have been taken at the school due to the shooting.
The police are looking for an unknown perpetrator.
The alarm about the shots came at 13 o'clock on Monday, local time.
The text is updated