At least 140 Nato troops - including 19 British soldiers - have been killed in so-called green on blue attacks in the Afghanistan conflict.
ITV News has obtained exclusive footage showing that for the first time women are playing a key role in the new look Afghan police force.
As British forces end their command of Helmand, there is growing evidence that the conflict is having an unrelenting toll on children.
The Associated Press news agency has said in a dispatch that its photographer Anja Niedringhaus had been killed in eastern Afghanistan. Reporter Kathy Gannon was also wounded in the attack.
Anja Niedringhaus, 48, an internationally acclaimed German photographer, was killed instantly, according to an AP Television freelancer who witnessed the shooting.
According to AP, the two were traveling in a convoy of election workers delivering ballots from the center of Khost city, when a unit commander named Naqibullah walked up to the car and opened fire on them in the back seat with his AK-47.
The attack comes on the eve of the April 5 presidential elections Islamist insurgency groups claim is a "Western-backed sham".
The disbandment yesterday of the UK's military headquarters in Afghanistan is the latest in a series of steps marking Britain's withdrawal of combat troops from the country - due to be complete by the end of this year.
Last month the MoD announced the closure or handover of three frontline bases in Helmand, leaving just one outside Camp Bastion.
Some 448 British forces personnel or MoD civilians have died in Afghanistan since the start of operations in October 2001.
The UK's military headquarters in Afghanistan has been disbanded in the latest major step in the withdrawal of British troops.
British-led Task Force Helmand came to an end yesterday after eight years of frontline military operations involving tens of thousands of UK servicemen and women.
Its functions will now be absorbed into the wider US-led Regional Command, the Ministry of Defence said.
NBC News Chief Foreign Correspondent Richard Engel, who is in the Afghan capital Kabul, wrote on Twitter: