MOUNT PROSPECT (CBS) — A northwest suburban man stabbed his brother with a steak knife during an argument Saturday at his Mount Prospect home, then rammed his vehicle into his brother’s car, according to police.

The brothers were arguing about 1:40 p.m. in the 100 block of South Audrey Lane when Robert M. Jastrebski, 55, stabbed his brother in the abdomen and hand, police said.

Jastrebski’s 59-year-old brother, from Chicago, called police after suffering the injuries, which were not life-threatening, police said. He refused medical treatment.

While the injured man was in his vehicle calling police, Robert Jastrebski backed his vehicle into his brother’s before driving away, authorities said.

An officer later stopped Jastrebski’s vehicle, which was heading south on Busse Road and he was arrested, police said.

He later admitted stabbing his brother, according to authorities. Prosecutors would not say what motivated the attack.

Robert Jastrebski was charged with a aggravated battery with a deadly weapon, and was ordered held on a $100,000 bond.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2013. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)