A photo has emerged online which appears to show two men urinating on the 7/7 memorial in Hyde Park. It's thought the men had been to the British Summer Time Festival nearby.
Users on Reddit suggested the festival goers had no idea it was a memorial, and may not have been deliberately disrespectful.
On Monday, the 7/7 memorial was defaced just hours before survivors and bereaved families gathered to commemorate the ninth anniversary of the attacks.
The stainless steel columns of the memorial in Hyde Park, central London, were daubed with red and black slogans overnight with the messages "4Innocent Muslims" "Blair Lied Thousands Died" and "J7 Truth".