A tiger shark that mauled to death a Russian tourist is suspected to have killed twice last summer, a marine biologist has said.
The theory emerged as a new eyewitness told of the horrific moment he sought to save stricken Vladimir Popov, 23, in the sea in Hurghada, Egypt.
Russian Telegram channels cite rescuer Mohammed who said: "When I swam up to the man, the water was full of blood.
