>> bill: we're learning more about what led to the attacks on police officers in busy champs-elysees in paris. this was the scene today in the area near where that happened. you can see a memorial has been set up with lots of people leaving flowers and candles. neighbors telling local media that the shooter had a longstanding problem with police. isis claiming responsibility for the shooting that killed one officer yesterday and injured two others, a german tourist also injured according to a french official there. greg palkot spoke to a witness about the attack. >> we saw the shooter with the gun. he started shooting bullets in the air. the police were in the street. it was a terrifying moment.