BBC News with David Legge

The commander of United States and Nato forces in Afghanistan, General David Petraeus, has ordered an investigation into the death of a kidnapped British aid worker killed during a rescue attempt on Friday. His announcement comes after the US military revealed that the aid worker Linda Norgrove may have been killed by a grenade thrown by American troops trying to rescue her. From Kabul, Nicholas Witchell has this report.

For 48 hours over the weekend, officials here had spoken about an explosion initiated by one of the extremists, possibly from a suicide bomb vest. Quite why it took the Americans so long to verify the accuracy of the picture they were giving isn't clear, but this morning they suddenly disclosed that surveillance footage together with discussions with members of the team meant that they could not now conclusively determine the cause of Ms Norgrove's death. There will now be a joint investigation by the American and British military, which is likely to take several days.

In Chile, the first test has been carried out of the narrow steel capsule that will be used to try to rescue 33 miners who have been trapped underground for the past two months. Caroline Hawley is at the mine in San Jose.

Preparations are now moving ahead swiftly for the operation to winch the miners out of what they described as their underground hell. Not only is the escape shaft ready, but the special capsule that was sent down to rescue the men has been tested to a depth of 610 metres, and the Mining Minister Laurence Golborne says all went well. The miners will be taken off solid food ready for their ascent and given only specially-enriched drinks. This extraordinary rescue mission is now due to begin by early Wednesday morning.