Cook County Bomb Squad investigators determined there was no explosion, only a fire early Wednesday outside Glenbrook Hospital parking lot.
Staff at Glenbrook Hospital, 2100 Pfingsten Road, reported an explosion around 4 a.m. Wednesday in its west parking lot, Glenview police said. Two schools were closed as a precaution.
Officers said in a morning statement a "crude incendiary device" was found nearby, but a bomb squad later found no evidence indicating the presence of an explosive device.
Police later arrested a 20-year-old Niles man in connection to the fire.
Leonard Reinebach was arrested at his home and charged with criminal damage to property and disorderly conduct, a police release said. Reinebach was released on a $1,000 D bond and is scheduled to appear in court April 13.
No one was injured, and police said the fire caused only minimal damage to the lot's surface. The hospital is still operating, though staff initially limited access to the building.
Glenbrook South High School, 4000 West Lake Ave., and Winkelman School, 1919 Landwehr Road, were closed for the day.