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.
The NATO-led force in Afghanistan issued a statement on Friday saying that that two of its troops went missing on Wednesday while on a routine supply mission.

The statement said a search operation is under way, but did not give many details. A NATO press officer said that "We continue exhaustive search and rescue operations to locate our missing service members. We are doing everything we can to find them."

Local police said that the soldiers were likely swept away by a river in Badghis, a western province, while they were trying to get to an airdropped food parcel that had fallen into the river. Officials said it was not likely that they were taken captive.

"The families of these service members have been notified about their loved ones' status and we will continue to keep them informed as information becomes available," a press officer said.