Canine units swept the train about 3:30 p.m. and found no signs of a threat, Barrington police said.
Although the threat did not indicate a specific date, the high school said it increased police and security at entrances of the building on Monday.
The officer saw Demarco McCranie, 53, weaving in and out of traffic in a gray 2007 Mercury about 12:40 a.m. on Harlem Avenue near Addison Road.
Students at Oak Park and River Forest High School should get their books in three or four weeks.
The male suspect brandished a handgun while robbing Android Wireless & Repair at 6315 Woodward Ave., police said.
Mario Moss pulled out a handgun and fired a single shot into the air during an argument last week in the 700 block of Dodge Avenue, police said.
Alonzo Campos, 20, allegedly shot the 48-year-old woman multiple times with a BB gun before stabbing her to death, authorities said.
Students to get autographs even though yearbooks are delayed by ‘white nationalism’ hand gestures in photos
The blank signature pages are expected to be distributed before school is out for summer.
Jose Charles, 25, is charged with one count of drug-induced homicide for the death of Trevor Brubaker.
"Currently, there is no evidence to suggest that the victim was an involved party in the fight or the intended target of the shots fired," Wilder said.