AP PHOTOS: A Look at the Chicago Marathon Chicago Marathon runners hit the streets Sunday morning, nearly six months after the Boston Marathon bombings, with more security lining race route and spectator areas. Runners from more than 120 countries and all 50 states observed a moment of silence for the victims and families before the race kicked off. But there was a different feel to this event in the wake of the Boston bombings, which killed three people and injured more than 260 others. Here's a gallery of photos from the race and its surroundings. Follow AP photographers and photo editors on Twitter: http://apne.ws/1hOr4by