<span>Friday 5 July 2002 05.38 EDT </span> <span>First published on Friday 5 July 2002 05.38 EDT </span> It was an anonymous phone call in the hot summer of 1944 which led the Gestapo and Dutch security police to the concealed annexe in a canalside house where Anne Frank and her family had hidden for almost two years. For almost 60 years, the identity of that informant, whose call had such tragic consequences, has remained a mystery to historians and the most dogged Nazi hunters.
But Dutch government historians disclosed yesterday that two new theories about who betrayed 15-year-old Jewish schoolgirl Anne Frank to the Nazis in occupied Amsterdam are so compelling that they are reopening their investigations.
