UK troops deployed in big Afghan offensive British troops have begun their biggest offensive since the start of the Afghanistan war, as US-led forces escalate their assault on al-Qaeda and Taliban fighters. About 1,000 British troops were deployed in south-eastern Afghanistan as part of an operation expected to last some days. The US has meanwhile sent hundreds of troops and attack helicopters to the Afghan mountains, near Khost, on the border with Pakistan. 10:12  | Read US charges Islamic charity head with perjury The US released the first detailed claims of links between a big Islamic charity and the al-Qaeda organisation, alleging that the head of a Chicago-based foundation was a close associate and fundraiser for Osama bin Laden. 10:28  | Read Campaign on terror - phase two International support for America's war on terror was thrown into doubt when President Bush signalled a widening of the war and the start of a second stage, more difficult to prosecute than the first. Read more Special relationship New golden age of friendship with the US may be tarnished Closer examination of the relationship between Bush and Blair reveals a triumph of presentation over diplomacy Mid-east crisis Taking a tougher line The US now sees the Israeli-Palestinian conflict in the context of its wider war against terrorism. In doing so, it has angered and confused its allies. International coalition Military strategy: 'try and speak slower' Creating an efficient and harmonious military operation with multinational forces. Have your say Community: Discussion forums Join FT.com's series of lively discussions surrounding the campaign on terror.