Chicago police said Alexander Podgorny fired shots at Moran Park in Englewood Thursday morning. A gunshot detection system alerted police to the incident.
When officers arrived, they found Podgorny in a van with a shotgun, an AR-15, two other handguns and ammunition.
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During the incident, police said he ranted about his brother, drug addiction and his missing dog.
Podgorny was placed under arrest and was charged with unlawful use of a weapon.