In 2008, attention was drawn to a form known as repo 105 following the Lehman collapse, as it was alleged that repo 105s had been used as an accounting trick to hide Lehman's worsening financial health. Another controversial form of repurchase order is the "internal repo" which first came to prominence in 2005. In 2011, it was suggested that repos used to finance risky trades in sovereign European bonds may have been the mechanism by which MF Global put at risk some several hundred million dollars of client funds, before its bankruptcy in October 2011. Much of the collateral for the repos is understood to have been obtained by the rehypothecation of other collateral belonging to the clients.