The crime happened about 9:30 a.m. Tuesday in the 2700 block of North Mango in the Belmont Central neighborhood on the Northwest Side, police said in a news release from the Chicago Police Department Office of News Affairs. The three men forced their way into the victim's home to commit a robbery, police said; during the robbery, one fired a handgun at the victim, a 46-year-old man who was transported in serious condition to Adventist Illinois Masonic Medical Center.