Anton ahlers biography

Dutch historians are reopening investigations into who made the anonymous phone call which led the Nazis to the hiding place of Anne Frank and her family on a warm summer evening in 1944.

We don't have a favourite at the moment, but we're going to look carefully at the arguments

David Barnouw Historian

Anne's teenage diary of a Jewish family in hiding in occupied Amsterdam has been translated into dozens of languages and read by millions worldwide.

But to this day, nobody knows for sure who told the Nazis about their presence in the Amsterdam canal house - making a telephone call which ultimately led to the deaths of Anne, her sister and her mother in German concentration camps.

"We decided to look again at the issue because there have been a couple of books published recently which suggest new suspects," historian David Barnouw of the Netherlands Institute for War Documentation (NIWD) told BBC News Online.

"We don't have a favourite at the moment, but w