Guardian Daily: Three British soldiers killed by rogue Afghan soldier

Three British troops have been killed by a renegade Afghan soldier during a joint patrol with local forces in southern Helmand. Reporter Jo Adetunji says the tragedy highlights the problems Nato faces in training Afghan security forces. Parents have defended the salary of a headteacher who turned the fortunes of an inner-city primary school around. But the Guardian's education editor, Jeevan Vasagar , says the government is planning to cap headteachers' pay. An Iranian nuclear scientist who went missing during a pilgrimage to Mecca a year ago is seeking refuge at Pakistan's embassy in Washington . Iran claims Shahram Amiri was kidnapped by the CIA. The Guardian's Middle East editor, Ian Black , says there are many unanswered questions. Hopes are rising that a new cap will stem the flow of oil from BP's gushing wellhead in the Gulf of Mexico. Our US environment correspondent, Suzanne Goldenberg , says it's a temporary solution. Steven Morris reports from Torbay, in Devon, on the revival of pierrot shows, popular in the early part of the 20th century.