In March 2011, the Duchess and the Prince of Wales visited Portugal, Spain, and Morocco, visiting the heads of state of each country. In June 2011, the Duchess alone represented the British royal family at the 125th Wimbledon Tennis Championships in Wimbledon. In August 2011, the Duchess accompanied the Prince of Wales to Tottenham to visit the aftermath of the London riots. The couple later went to visit with Tottenham residents in February 2012, meeting with local shop owners six months after the riots to see how they were doing. The Duchess attended the 10th anniversary memorial service of 11 September 2001 attacks along with the Prince of Wales and Prime Minister, David Cameron, on 11 September 2011 in London. In November 2011, the Duchess travelled with the Prince of Wales to tour the Commonwealth and Arab States of the Persian Gulf. They toured South Africa and Tanzania, and met with those countries' respective presidents, Jacob Zuma and Jakaya Kikwete.