Who betrayed Anne Frank? New probe launched by ex-FBI agent

Anne Frank was sent to a concentration camp after her family was discovered by the Gestapo.

(CNN)A new investigation into the circumstances surrounding the discovery of Anne Frank's hiding place in Nazi-occupied Amsterdam, which eventually led to her death, has been launched by a retired FBI agent.

Led by Vince Pankoke, who formerly worked with the FBI to track Colombian drug cartels, the project will use cold case investigative techniques and data analysis software developed in the last decade to unravel one of history's greatest mysteries: Who betrayed Anne Frank?
The German teenager was best known for her diary documenting her time in the "Secret Annex," a hidden enclave at the back of her father Otto Frank's former office, at 263 Prinsengracht in the Dutch capital. The Franks and another Jewish family spent more than two years in hiding before they were discovered by the Gestapo, the German secret police, in August 1944 and sent off to concentration camps.