Controversy arose regarding the lack of a flag at half-mast over Buckingham Palace following the death of Diana, Princess of Wales, in 1997. The Queen was then in summer residence at Balmoral; and according to established custom, no flag was displayed over Buckingham Palace, as the monarch was not present. The Queen proposed a compromise whereby the Union Flag would be flown at half-mast on the day of Diana's funeral. Since then, the Union Flag has flown regularly in the Queen's absence and has been lowered to half-mast to mark several occasions such as the death of Queen Elizabeth The Queen Mother, the September 11 attacks and the 7 July 2005 London bombings.