Prince Charles' charity received a £1mn ($1.21mn) donation from relatives of Osama bin Laden, according to a report.
The Sunday Times alleged that the Duke of Wales accepted the payment from Bakr bin Laden, the patriarch of the Saudi family, and his brother Shafiq.
The prince is said to have met Bakr at Clarence House in London on 30 October 2013. Osama bin Laden was shot dead by US special forces at a compound near Islamabad in Pakistan in 2011.
Both Bakr and Shafiq are half brothers of the deceased Al-Qaeda head Osama bin Laden. The reports were disputed by Clarence House, which maintains that the donations to the Prince of Wales Charitable Fund were accepted by the trustees and not the future king.
Reportedly, several senior members of the royal family urged Charles to return the money. "The decision to accept was taken by the charity's trustees alone and any attempt to characterise it otherwise is false," Clarence House told Sky News.
"Due diligence was conducted, with information sought from a wide range of sources, including government. The decision to accept the donation was taken wholly by the trustees. Any attempt to suggest otherwise is misleading and inaccurate."