CHICAGO (WLS) -- A Chicago Cubs security employee was taken to the hospital after coming in contact with a "foreign substance" in the mail near Wrigley Field on Tuesday afternoon, according to a spokesperson for the team.
Chopper 7 was over the scene at Waveland and Clark.
Officials said the employee received a piece of mail at an office building that sits directly west of the ballpark, right next to Gallagher Way.
Someone called 911, and the employee was taken to Illinois Masonic Hospital by ambulance after coming into contact with what police called a "skin irritant."
A Cubs spokesperson later said in a statement that the employee had an allergic reaction, and has since been released from the hospital.
Chicago police officers said they responded to a Level 1 Hazmat situation, and said the bomb unit is on the scene.
The Cubs spokesperson also said they have not been asked to leave their buildings or shelter in place.
The Chicago Fire Department, the Postal Inspection Service and the FBI also responded to the scene.
Officials surveyed the area, but have not yet provided further information about what may have been in that piece of mail.