An armed robbery in broad daylight at a business in the Loop led a security guard to fire shots at the suspect, officials said, with heavy police activity and CTA trains rerouted.

About 11:19 a.m., a male security guard was exiting a business in the 0-100 block of South State Street when he was approached by someone who attempted to rob him, police said. A struggle ensued and the security guard produced a gun and fired shots, striking the suspect.

The suspect then fled the scene with proceeds, police said, but was found and apprehended a short time later.

The suspect was transported to a nearby hospital and was last listed in stable condition. Charges were pending, police said.

No other injuries were reported.

CTA blue line trains were bypassing a busy Loop train station as part of the incident

An alert on the CTA website at 12:01 p.m. said trains on the Blue Line were bypassing the Washington stop “due to police activity.”

This story will be updated as more details become available.