Three US soldiers have been shot dead by an Afghan worker on a military base in southern Afghanistan.
It is the latest incident in a deadly 24 hours for NATO-led forces in the country during which six soldiers died in rogue attacks.
The shooting took place late last night in the Garmsir district of Helmand province, not far from where three US special forces soldiers were killed by an Afghan policeman and comrades earlier in the day.
The soldiers were shot dead by a base employee who turned his gun on them, in the third rogue attack in four days. Military sources said the man had not been wearing a uniform and it was unclear how he got hold of the weapon.
An Afghan police commander and several of his men killed three US Marines earlier in the day after inviting them to a dinner to discuss security. Afghan officials had earlier said that incident happened on Thursday night.
The first three men were all Marine Corps special operations forces and appeared to have been killed in a planned attack by rogue Afghan forces. NATO calls such incidents green on blue attacks.
The NATO force says there have been 26 such attacks on foreign troops since January in which 34 people have been killed. Last year, there were 21 attacks in which 35 people were killed.
