Warning: The footage in this story may be disturbing to some viewers.Surveillance footage provided to sister station KCCI captures the moment a police pursuit in Des Moines, Iowa, ended in a crash. Iowa State Patrol troopers confirmed that they initiated the pursuit of a car driven by 20-year-old Yackhub Ali around 9:30 p.m. Sunday in the Drake University neighborhood.Troopers said they temporarily lost the