Nicholas Wenton was a young clerk at the London Stock Exchange during World War II when he almost single-handedly saved more than 650 Jewish children from the Holocaust. "Britian's Schindler", as he was called, died Wednesday at the age of 106 in a hospital west of London, his family said. Wenton would arrange trains to carry children from Nazi-occupied Prague to Britain, battling bureaucracy at both ends and saving them from almost certain death. British Prime Minister David Cameron said "the world has lost a great man." Jonathan Sacks, Britain's former chief rabbi, said Winton "was a giant of moral courage and determination, and he will be mourned by Jewish people around the world." In Israel, President Reuven Rivlin said Winton will be remembered as a hero from "those darkest of times."