It was an amazing and gruesome sight when a Cape Cod tourist witnessed a great white shark attacking a seal close to the beach on the Cape Cod National Seashore. Terese M. Carena, who was visiting the Cape from Arizona, took photographs of the attack.Scroll through to view Carena's shots of the incident. Warning: Some of these images are graphic.

Read the Boston Globe article: Shark attacks a seal off Cape beach

Photos: The region's Summer of the Shark