Second deadly attack on Nato-led troops in Afghanistan
Three soldiers from the Nato-led coalition in Afghanistan have been shot dead by a civilian worker at a military base.
The attack happened in the Garmsir district of Helmand province.
It is the second such incident within 24 hours.
Three US soldiers were also killed by a man wearing a policeman's uniform earlier in the day.
The BBC correspondent Aleem Maqbool reports from Kabul.