"Four International Security Assistance Force (ISAF) service members died following separate improvised explosive device (IED) attacks in southern Afghanistan yesterday," the US-led ISAF said in press release on Sunday morning.

It provided no other details on the attacks, including the nationalities of the service members However, the contingents stationed in southern Afghanistan are known to be mostly from the United States, Britain and Australia. .
One is thought to be a British soldier killed Saturday in an explosion in the Nahr-e Saraj region of southern Helmand province. The British Ministry of Defense announced late Saturday that the soldier died while traveling in a vehicle.
Another NATO service member died Friday in an Mujahideen attack in eastern Afghanistan. No details have been given on that death.

Source

http://www.presstv.ir/detail/2012/05/27/243284/usled-soldiers-killed-in-afghanistan/