Chicago police have arrested a 15-year-old boy after he allegedly assaulted a 71-year-old man and stole his car Friday.

Police say the teen attacked the elderly man in southeast Chicago, causing serious injury, before taking the man's vehicle. Police arrested the teen moments after the incident.

Authorities later confirmed that the same teen had been seen driving a vehicle stolen from a 70-year-old woman earlier in the week, according to CBS Chicago.

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Chicago Police Superintendent Eddie Johnson prepares to speak with reporters.

Chicago police prepare for a press conference. (Reuters) (Reuters)

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The teen faces one felony count of aggravated vehicular hijacking with a weapon, one felony count of aggravated battery with use of a deadly weapon, and one felony count of possession of a stolen vehicle, according to CBS.

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It is against police policy to identify or release photos of minors when charged with crimes, and police have not identified the victim.