Source:
Reuters (Reuters) - Four soldiers fighting with the NATO-led alliance were killed in an attack believed to involve members of the Afghan police in southern Afghanistan on Sunday, the coalition said.
The attack came a day after two British soldiers were shot dead by an Afghan policeman while returning from a patrol in southern Helmand province, one of the strongholds of the Taliban-led insurgency.
The shooting took place in Zabol, a southern province where U.S. forces are based, according to a local official, who said all four soldiers killed were American.
Read more:
http://uk.reuters.com/article/2012/09/16/uk-afghanistan-attack-idUKBRE88F00Z20120916
Article refers to Sunday. This is four additional US forces on top of the two British shot on Saturday mentioned here :
http://www.democraticunderground.com/1014231669