A man who sexually assaulted a woman at knife point near Regal Street and 54th Avenue on Monday is described as white and in his early 20s, 5-foot-8 and muscular with a thin build. He wore baggie jeans and a dark checkered hooded sweatshirt, with the hood over his head. Spokane police released that description today as detectives continue to investigate the assault, which occurred just after 6 p.m. as the 18-year-old victim was walking with her infant child south on Regal toward 54th from Southeast Boulevard and 29th Avenue. The woman, who lives in the area, told police the man came out of a dark area, confronted her with the knife and threatened to harm her baby. The infant was not injured during the assault, said Officer Jennifer DeRuwe, spokeswoman for the Spokane Police Department. The woman called police and was taken to a local hospital. Her assailant fled on foot, police said. Detectives urge anyone with information to call Crime Stoppers at (509) 327-5111 or (800) 222-TIPS.