tacked the World Trade Center in New York City. Narly 3,000 people were killed, and many were trapped under the collapsed buildings. When Canadian police officer James Symington heard about the attacks, he knew he and his trained search and rescue dog, Trakr, had to help. Follow Trakr's lead as he and Symington bravely search and dig through the rubble to help rescue survivors of one of the deadliest days in U.S. history.