Attacks by Afghan troops on foreign soldiers have long been a major problem, but have declined in recent years. Wednesday's killings mark the first such attack since the Taliban's bitter leadership battle.
Ben Anderson went to Afghanistan's most violent province, Helmand, to see how things are going since the withdrawal of American and British infantry troops 18 months ago.
An attack on an area of Kabul that is home to many foreign embassies and senior Afghan officials follows a recent surge in violence that has left dozens dead across the country.
Several defectors from the Taliban pledged allegiance to the Islamic State in a video released over the weekend, and reports suggest they are a growing threat in Afghanistan.
Insurgents vow to reinstall Islamic government and drive 13,000 remaining troops out of the country after coalition's 13-year mission comes to official close.
A group of militants stormed a bank in the Helmand province of Afghanistan today, leading to a fierce gunfight with security forces and leaving at least five dead.
A suicide bombing near Bagram Airfield killed two US soldiers Friday night, the latest in a string of deadly attacks to hit as American forces prepare their withdrawal.
As the US and the UK withdraw from Afghanistan, violence in the country is getting worse. VICE News went to a hospital in Helmand to witness the extraordinary and routine suffering of Afghan civilians.
Afghanistan's opium production is set to break records this year — a booming illicit economy in a country with few opportunities.