CPD investigating at downtown parking garage after reported sexual assault

There are reports of an attack and sexual assault in a downtown Chicago parking garage Monday morning.

A Chicago police vehicle has been near the Millennium Park garage near Michigan Avenue and Randolph Street all morning.

Investigators were seen gathering evidence in the garage, as well.

Chicago police have not yet confirmed any details on the incident.

SEE ALSO: Teen boy charged after 15-year-old girl sexually assaulted at gunpoint in Ravenswood Manor: police

According to police scanner traffic, CPD responded about 7 a.m. for reports of a criminal sexual assault inside the garage.

It appears the suspect ran off to a nearby CTA Red Line train heading south, while witnesses chased after him.

Chopper 7 captured video of an arrest outside a Red Line station that could be connected to the incident.

The garage appeared to be open later Monday.

This is a developing story; check back with ABC7 Chicago for updates.

INTERACTIVE SAFETY TRACKER | Track crime and safety in your neighborhood