Britain’s Prince Charles and his wife Camilla have begun a week-long tour of the USA at one of the country’s most emotive sites. At Ground Zero, they paid tribute to the 2,749 victis of the attacks which destroyed the World Trade Centre on September 11, 2001.Charles and Camilla are on their first official overseas trip since marrying in April. After Ground Zero, the couple were greeted by well-wishers at the British Memorial Garden. They unveiled the centre stone, embossed with the crest of the Prince of Wales, and met family members of the British victims of the“9/11” attacks. The 56-year-old prince was later welcomed to United Nations headquarters by Secretary-General Kofi Annan, and addressed a seminar on youth enterprise. Today Charles and Camilla are dining at the White House. On Friday, they will meet survivors of Hurricane Katrina in New Orleans, before travelling to San Francisco. An opinion poll suggested four in five Americans had no interest in the trip. But many New Yorkers reacted positively to Camilla, who has been compared unfavourably to the late Princess Diana by the tabloids.