WAUKEGAN, Ill. — A Waukegan police officer shot and killed a man Wednesday afternoon who authorities say was advancing toward him with a knife, hammer and gas can taped to his chest.

Around 12:45 p.m., Waukegan officers responded to the 1000 block of Glen Court for a reported neighbor dispute. Officers learned that one of the neighbors was trying to start a chainsaw and had gasoline.

Arriving officers encountered a wooden fence separating the properties on fire, police said. The armed man approached as the officer attempted to put out the blaze with a fire extinguisher.

Police ordered the male subject to stop advancing. The officer opened fire when the male offender didn’t comply, fatally wounding the victim.

The male subject, believed to be a Waukegan resident in his 20s, was pronounced dead at the scene. His name has not been released, pending an autopsy and the notification of next of kin, police said.

News of the shooting rattled the neighborhood. Monica Thornton told WGN News that her mother and paralyzed brother were inside their two-story home when she says their next-door neighbor came over acting out of control.

“He actually FaceTimed me and I can hear him saying, ‘this guy next door, he has a gas can and trying to set the house on fire,'” Thornton said. “‘He ran out of gas and went to grab a hammer. He’s running back and forth and broke all the windows on my mom’s house.'”

Thorton added that Wednesday’s incident was not the result of a neighborhood dispute.

“I think the guy was mentally ill,” Thornton said.

While grateful that her family is safe, Thornton told WGN News that she is heartbroken that the incident took such a tragic turn.

“Just a very scary situation,” she said. “Hated that this had to happen.”

Waukegan Deputy Chief Joe Florip said the police officer who discharged their service weapon is a 15-year-veteran of the department.

Officials asked Illinois State Police to head the investigation.