Afghan police say the two NATO soldiers reported missing in Afghanistan are Americans believed to have drowned in a river in the western province of Badghis.
The province's deputy police chief, Abdul Jabar, said the two soldiers were swept away Wednesday while trying to save supply boxes that fell into the water after being air-dropped.
The NATO-led force in Afghanistan said earlier that two service members disappeared Wednesday while on a routine supply mission, but did not identify their nationalities.
A NATO spokeswoman said troops were conducting a massive search and rescue operation to locate the missing soldiers.
In a separate statement, NATO said two U.S. soldiers were killed Thursday in a roadside bomb attack in southern Afghanistan.
This year has been the deadliest for international troops in Afghanistan since the fall of the Taliban-led government in 2001.
On Thursday, angry Afghan villagers chanted slogans against foreign troops, protesting an overnight air strike by international forces that they say killed at least nine civilians.
The villagers paraded the bodies of the victims in the streets of Lashkar Gah, capital of restive southern Helmand province.
Local authorities said only Taliban insurgents died in the attack.
Some information for this report was provided by AFP, AP and Reuters.