

A great white shark attack left tourists screaming in terror as the water turned blood red.
Families on board a whale-watching tour boat witnessed the predator sink its teeth into a seal neard Green's Point Lighthouse in Brunswick, Canada.
Video footage captured by captain Theophilos Tsagkaris shows the shark's fin slicing through the surface of the water as it attacks the helpless mammal.
Whale-watchers can be heard screaming as the drama unfolded just yards from the boat deck.