Videos show speed , used by terrorists in Paris attack , Mark Hertling says . Attack 's timing indicates intelligence and strategic planning on part of terror team , Hertling says . He calls it a follow - on attack after earlier attacks on Charlie Hebdo laboratories .
Videos show speed , preparation by terrorists in Paris attack , Mark Hertling says . Attack 's timing indicates intelligence and route planning on part of terror team , Hertling says . Hertling calls it a follow-on attack after earlier firebombing on Charlie Hebdo failed .