<p><br /> Memorial services have been held around the world for the victims of the 9/11 attacks.<br /> </p><p><br /> Nearly 3,000 people were killed when Muslim extremists hijacked four planes and flew two into the World Trade Centre and a third into the Pentagon on September 11, 2001.<br /> </p><p><br /> Memorial services were taking place at the crash sites, with a remembrance event at Ground Zero in Manhattan followed by rallies for and against plans to open an Islamic centre nearby.<br /> </p><p><br /> Speaking at the Pentagon, US President Barack Obama said the anniversary should be a day not only to mourn the 9/11 victims but to show that Americans "are not at war against Islam".<br /> </p><p><br /> He added: "We're at war against terrorist organisations that have distorted Islam or falsely used the banner of Islam to engage in their destructive acts."<br /> </p><p><br /> British victims of the atrocity were remembered in Grosvenor Square, London, as floral tributes were laid on behalf of the UK and US governments. A senior Civil Service official placed 67 roses - one for each of the British victims of the September 11 attacks.<br /> </p><p><br /> The flowers carried a hand-written message from Prime Minister David Cameron, which read: "In memory of the victims of terrorism in the USA on 11 September 2001. They will never be forgotten."<br /> </p>
