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CHICAGO —Chicago police conducted an active shooter drill at Water Tower Place Tuesday morning.

The drill began at 6 a.m. at the Loop shopping center located at 835 N. Michigan Avenue, and ended around 8 a.m.

It was designed to help train the Chicago Police Department and Water Tower Place security in the case of an active shooter situation.

About 40 to 50 people participated in the exercise, simulating a person opening fire inside the mall.

Training activities took place both in and outside of the Water Tower and signage was posted along surrounding streets to make residents aware.

Ald. Brian Hopkins (2nd Ward) said these drills are usually discreetly performed in the early morning hours, but a decision was made to alert the public after confusion ensured earlier this summer during a drill that the public was not made aware of.