A Taliban suicide bomber has killed 17 people in an attack on a NATO convoy in the Afghan capital, Kabul.
It is the deadliest single ground attack since the US-led invasion ten years ago.
The attacker set off a car bomb that killed 13 American troops, three Afghan civilians and a police officer.
It happened in the west of city, close to the former royal palace and several government buildings.
Violence across Afghanistan is at its worst since 2001, according to the United Nations.
NATO has more than 130,000 troops stationed in the country. They are set to leave by the end of 2014.