Why was the hiding place discovered?

Answer 1

Somebody called the German Security Police to notify them that Jews were in hiding at 263 Prinsengracht. Exactly who that was has never been discovered. This is a question that many people still want answers to. There were certain suspicions and a first investigation was conducted in 1948. Fourteen years later, once again, an attempt was made to unravel the mystery of who was responsible for the betrayal. Yet, the mystery is still to this day, not solved

Answer 2

The hiding place of Anne Frank and her family in Amsterdam was discovered by the Nazis in 1944 due to a tip-off from an informant. The authorities arrested them and deported them to concentration camps, where Anne and her sister Margot ultimately succumbed to typhus.