Chicago's Office of Emergency Management and Communications says there are no credible threats to Chicago. But the city is still on high alert after two deadly explosions today near the finish line of the Boston Marathon. So far, two people are confirmed dead. According to the Boston Globe, more than 100 are injured. The Boston Marathon attracts a half million spectators every year, and it's the world's largest annual marathon. Chicago resident Amy Brauer was at the marathon to cheer on her sister this afternoon. Amy was standing on the sidelines between the two explosions. She joins us by phone on Chicago Tonight at 7:00 pm.