The Exercise Tiger Disaster An Uncovered Tragedy: On April 28, 1944, E-boats from Cherbourg attacked Exercise Tiger, a rehearsal for the D-Day landings, in Lyme Bay, England. High Casualties: The E-boat attack resulted in approximately 750 American servicemen losing their lives. A Cover-Up: The incident was so grave that US authorities ordered a complete information blackout to prevent the Germans from learning about the extent of the damage and future invasion plans. A Lasting Impact: Survivors

TIGER ATTACK INVESTIGATION: New video shows a veteran zookeeper inside a tiger enclosure at the Topeka Zoo just before she was attacked, with her health now improving and zoo officials investigating why she was in the same space as the tiger to begin with. Zachary Kiesch reports. https://abcn.ws/2PrOTz9 | ABC World News Tonight with David Muir

TIGER ATTACK INVESTIGATION: A tiger attack at a Topeka, Kansas zoo is under investigation after a zookeeper was badly injured when a tiger pounced on her in front of visitors. Zachary Kiesch reports. https://abcn.ws/2XwHLoe | ABC World News Tonight with David Muir