Update from this morning.
The Taliban have claimed responsibility for the killing of five British soldiers by a rogue Afghan policeman in Helmand Province.
The servicemen, three from the Grenadier Guards and two from the Royal Military Police, died when the officer turned his gun on them at a checkpoint in Nad-e-Ali in Helmand, dubbed the 'Wild West' by British soldiers, on Tuesday.
Another six British soldiers and two Afghan policemen were wounded in the shooting,
Gordon Brown, the Prime Minister, told the House of Commons that the Taliban had claimed responsibility for the killings.
British forces are now hunting down the rogue policeman. He was on the roof of the checkpoint when he opened fire on the British soldiers.
Police in Helmand said the attacker attended a police academy in Kandahar, southern Afghanistan, and had been working as an officer in the Nad-e-Ali area for three years.
Brigadier General Mirwais Noorzai, deputy regional commander of police, said Afghan officials were committed to uncovering the truth about what happened.
He told a press conference in Helmand's provincial capital, Lashkar Gah: "I have imparted our sympathy and regret to the families of the soldiers killed."
Sitting alongside him, Major General Nick Carter, the British commander of Nato troops in southern Afghanistan, stressed that it was a joint investigation between foreign forces and the Afghan authorities.
"This absolutely demonstrates the top-level commitment of the Afghan government into coming to terms and finding out what took place in this incident and learning the appropriate lessons from it," he said.
Defence Secretary Bob Ainsworth dismissed the claim that Britain could maintain security by relying on internal measures alone.
"We can't secure ourselves at the borders of Great Britain. If Afghanistan is not secure, then Pakistan will not be secure and Britain will not be secure. That is the whole purpose of us being there," he told BBC Radio 4's The World At One.
He acknowledged however that action needed to be taken to tackle the problems in the Afghan police.
"We absolutely have to get the Afghan security forces where they need to be both in terms and size and ability. That has to involve a cleaning up of the Afghan National Police service," he said.
They are not a police force as we understand it. Their priorities are not shoplifting, burglary and rape. There are police officers dealing with real policing; some like Malalai Kakar have been murdered. These "officers" are more like a militia. Poorly educated, not well disciplined and apparently a nightmare to attempt to train.
And here are some ludicrous and insulting remarks by Labour's Immigration minister, Mr. Woolas:
"Fury as minister says UK troops are fighting in Afghanistan to stop immigrants coming to Britain"