Nato's US-led International Security Assistance Force (Isaf) said three of its troops died in an "insurgent attack" in the east but gave no further details in line with policy.
A Western military official told AFP on condition of anonymity that the three soldiers were killed in a suicide attack in Asad Abad, the capital of Kunar province.
The nationalities of the soldiers were not disclosed, but American troops provide the bulk of the Nato mission in Kunar, a flashpoint for Taliban and other militants on the Pakistani border.
Local police chief, Mohammad Aywaz Naziri, told AFP that two insurgents wearing suicide vests blew themselves up as a group of foreign troops walked to the nearby governor's compound.
"This morning two suicide bombers targeted US soldiers who were walking from their base to the governor's compound," Naziri said. One Afghan was also killed in the blast, he added.
There was no immediate claim of responsibility but similar attacks in the past been claimed by the Taliban, leading a decade-long insurgency against the Kabul government and Nato troops.
The bulk of foreign combat troops are due to withdraw by the end of 2014 as part of plans to hand Afghan government forces responsibility for national security.
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@sam, The caption underneath the picture says; PHOTO: AFP/File. It's a file photo of the news agency.
NATO keeps the nationality of dead as secret because they are afraid of retaliation.
above picture is of German soldiers but in East Afghanistan there are mainly US troops. so probably they were americans not german.
Run for your lives Yankees, your time in this part of the world is over now.
Names not released... Looks like much more deaths than 3 have occured
America cant control East Afghanistan. after 2014 Taliban will rule East Afghanistan.
Good morning gentlemen. I am Xana Duque and I come to ask V. Exa. to communicate with me or give me news about my boyfriend and American soldier U.S. ARMY LUCAS BRANDBURY .. is in Afghanistan, there were attacks and how I wanted to know his whereabouts. Thank you and best regards Xana Duque
Two suicide bombers killed three soldiers. The taliban seem to be totally braindead