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.
