KABUL (AFP) - Peace in Afghanistan would be the best tribute to those killed in the September 11, 2001 attacks, the US ambassador to Kabul said Friday as the nation faces the worst violence in an eight-year war. US troops and officials in Afghanistan marked the September 11, 2001 anniversary with ceremonies at military bases and their Kabul Embassy, where Ambassador Karl Eikenberry presided over a brief commemoration. The greatest tribute possible to the men, women and children who died on September 11 and in the years since would be for Afghanistan, with our help and the rest of the international community, to achieve lasting stability and peace that has eluded it for decades, Eikenberry said. This is what we strive towards every day in this mission - an Afghanistan that can never again be used by violent extremists to plot attacks against American and other citizens of the world. Three Marines raised the US flag on the Embassy lawn, saluted and lowered it to half-mast. During a minutes silence, Embassy staff bowed their heads and shed tears as the national anthem played to end the memorial. Afghan President Hamid Karzai extended his condolences to the families of the victims on behalf of the people of Afghanistan who are more connected than other countries to the 9/11 incident. I am hopeful that eight years after this tragedy the world will continue its joint war against terrorism and transform the world into a safer place, safe from the threat of terrorism, he said in a statement.