A Chicago Transit Authority Blue Line train waits at the...

A Chicago Transit Authority Blue Line train waits at the Forest Park, Ill., train station for the eastern journey to downtown Chicago on Tuesday, Sept. 3, 2024, in Forest Park, Ill. Credit: AP/Charles Rex Arbogast

FOREST PARK, Ill. — A man suspected of killing four people aboard a Chicago-area transit train shot them at close range while they were asleep, officials said Tuesday.

The shooting took place before 5:30 a.m. Monday aboard the Chicago area’s L system, on a Blue Line train that was moving near where the line ends in Forest Park, a suburb about 10 miles (16 kilometers) west of downtown Chicago. Rhanni S. Davis, 30, was later arrested on another Chicago Transit Authority L line, according to police. Authorities charged Davis with first-degree murder Tuesday.

Forest Park Mayor Rory Hoskins said the victims likely didn't even see the shooter.

“They were shot execution-style as they slept," Hoskins told The Associated Press.

Margaret Miller, 64, and three men including Simeon Bihesi, 28, and Adrian Collins, 60, were fatally shot, according to the Cook County medical examiner's office. All of their addresses were listed as unknown. Police said they were still working to notify relatives of the fourth person killed, so his name has not yet been released.

Preliminary investigation shows the victims were on two different cars as the Blue Line train was headed toward Forest Park, police said. The Blue Line runs 24 hours and stretches from that suburb through downtown Chicago to O’Hare International Airport. It runs both below and above ground.

The suspected shooter fled. But police found and arrested Davis thanks to video footage from the train, Hoskins said.

A security camera and speaker hang from the ceiling of...

A security camera and speaker hang from the ceiling of the Chicago Transit Authority Harlem Ave. station over the rails that head West to Forest Park, Ill., station as two pedestrians walk toward the station, Tuesday, Sept. 3, 2024, in Forest Park, Ill. Credit: AP/Charles Rex Arbogast

Public records did not have a listed phone number for Davis. A message sent Tuesday to a listed email was not immediately returned. Forest Park police and the Cook County state's attorney's office did not immediately respond to messages about Davis' legal representation. The Cook County public defender's office said it wasn't representing him.

Davis is scheduled to appear in court at noon on Wednesday, according to Cook County State’s Attorney Kim Foxx, who spoke Tuesday evening during a media briefing in Forest Park. More details about the shootings will come out during that court hearing, she said. Investigators haven't determined a motive, police said at the briefing.

CTA officials said they were assisting in the investigation and that security footage “proved to be vital.”

“Although this matter remains under investigation, all current information points this being an isolated incident,” CTA President Dorval Carter Jr. said in a statement.

An emergency communication panel is seen on a Chicago Transit...

An emergency communication panel is seen on a Chicago Transit Authority Blue Line train Tuesday, Sept. 3, 2024, in Forest Park, Ill. Credit: AP/Charles Rex Arbogast

Forest Park police are used to calls to the busy transit stops there, Hoskins said. The CTA’s Green Line also ends in Forest Park and runs nearly 24 hours a day.

Over the years, nonprofit organizations have also used the transportation hubs for outreach and providing medical care and other services to homeless people who seek refuge aboard the trains, particularly in winter.

But the mass shooting in the community of 14,000 people has sparked new fears. Hoskins, whose position as mayor is part time, said he couldn't recall a homicide being reported in Forest Park in years.

His teenage son takes the L to school and he watched a little closer than usual at Tuesday morning's drop off.

“People are rattled,” he said. “We want to make them feel safe.”

Nassau County Executive Bruce Blakeman's plan to deputize gun-owning county residents is progressing, with some having completed training. Opponents call the plan "flagrantly illegal." NewsdayTV's Virginia Huie reports. Credit: Newsday Staff; WPIX; File Footage

'I don't know what the big brouhaha is all about' Nassau County Executive Bruce Blakeman plan to deputize gun-owning county residents is progressing, with some having completed training. Opponents call the plan "flagrantly illegal." NewsdayTV's Virginia Huie reports.

Nassau County Executive Bruce Blakeman's plan to deputize gun-owning county residents is progressing, with some having completed training. Opponents call the plan "flagrantly illegal." NewsdayTV's Virginia Huie reports. Credit: Newsday Staff; WPIX; File Footage

'I don't know what the big brouhaha is all about' Nassau County Executive Bruce Blakeman plan to deputize gun-owning county residents is progressing, with some having completed training. Opponents call the plan "flagrantly illegal." NewsdayTV's Virginia Huie reports.