CHICAGO – Chicago Police responding to a landlord's report that a tenant had pointed a gun at him found an AK-47 assault rifle and nearly 400 rounds of ammunition in the tenant's home.

Department officials say 54-year-old Frank Johnson is charged with aggravated assault with a deadly weapon, unlawful use of a weapon and possession of ammunition without a Firearm Owner's Identification Card. Officers in the Grand Crossing District on the city's South Side made the discovery after the landlord in Johnson's building called police Tuesday night.

The arrest came hours after Superintendent Garry McCarthy told reporters that officers have seized about 180 firearms this year, after seizing about 7,400 firearms last year.