The British family shot in the French Alps last month may have had links to ex-Iraqi dictator, Saddam Hussein.
Saad Al-Hilli, 50, was gunned down by an as yet unidentified killer, with his wife, Iqbal, 47, and his mother-in-law Suhaila Al-Allaf, 74. His two daughters, Zainab, seven, and Zeena, four, narrowly survived.
A French cyclist, Sylvain Mollier, 45, was also killed.
Flowers left near the scene of the shooting in France last month
French newspaper Le Monde claims that German intelligence officials have uncovered evidence that Al-Hilli's father, Kahdim, was given £820,000 by Hussein which was deposited in a Swiss bank account in his name.
Kahdim died last year and it is known that Al-Hilli was involved in a dispute with his brother, Zaid, over the contents of the will.
The allegations, if true, could shed light on a murder case that so far has investigators baffled.
Hussein is known to have withdrawn £620 million from the Iraqi central bank in 2003 before splitting the money up and depositing it around the world as a safety fund if he was ever overthrown.
It is thought that Hussein may have used Iraqi emigrants such as Kahdim to help him hide the money.
In the event, he was captured, tried and executed following the US-led invasion in 2003.
If Al-Hilli had access to Iraqi funds then it could provide a clear motive for the attack and potential leads to find the killer.
Zainab and Zeena are being cared for by relatives in a secret location as they are still considered to be in danger.
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The seven-year-old girl was critically injured but four-year-old Zeena survived unharmed by hiding under the bodies of her parents and grandmother.