Robert P. Joor, 55, of Highland Park.

Police say they arrested a man after he allegedly threatened his roommate with a gun and fired shots inside their residence in Highland Park.

Robert P. Joor, 55, of the 600 block of Hyacinth Place in Highland Park, was charged with aggravated assault with a deadly weapon, reckless discharge of a firearm and unlawful possession of a weapon by a convicted felon.

Police officers responded to Joor’s residence in the 600 block of Hyacinth Place in Highland Park around 11:30 p.m. Wednesday.

Officers received a call for a subject armed with a firearm, according to a police report.

Highland Park Deputy Police Chief William Bonaguidi said Joor had been arguing with a roommate and threatened the roommate with a gun.

Responding officers investigated and learned that Joor, at some point earlier, had been shooting the firearm inside the residence.

The shots were not directed at anyone but holes were observed in an interior wall consistent with bullet holes, Bonaguidi said.

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No bullet holes were found on the exterior of the residence, leading police to believe that all rounds fired were contained to the interior of the home.

Court records show Joor is a convicted felon and not allowed to possess a firearm.

Officers arrested Joor and transported him to the Lake County Jail following a bond hearing.

Joor remains held in the Lake County Jail on a $150,000 bond. He would need to post $15,000 cash in order to be released.

A court hearing is scheduled next for April 20.