Three soldiers were killed in an improvised bomb explosion and the fourth in an attack, the international force said, without giving further details or announcing their nationalities.
The deaths came one day after a British soldier was found dead close to his post in the restive southern province of Helmand hours after going missing, overshadowing a surprise visit by British premier David Cameron to the area.
The four deaths on Tuesday brought the overall death toll to 288 foreign troops killed this year in Afghanistan, according to a tally based on that collated by the independent website iCasualties.org.
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