now to the investigation into a deadly train shooting in Chicago Police say four people were killed and a suspect was tracked down through surveillance video and taken into custody Alex Perez is in Chicago with the latest good morning Alex hey good morning Rebecca still a lot of unanswered questions here but this terrifying ordeal comes after a string of violent incidents on Chicago's public transportation system now authorities say in all four people were shot and killed about 5:30 a.m. Monday on of the city's elevated commuter trains the victims who were on a Blue Line train in Forest Park were sleeping when they were shot according to authorities using surveillance videos investigators say they tracked the suspect who had jumped to a different train line and arrested him a firearm was also recovered the victims have not yet been identified now as of August 27th police say 627 violent crimes were reported on the CTA compared to 547 the same period last year now authorities believe this was an isolated incident but an exact motive remains unclear Michael all right thank you so much for that