Spoiler Alert. (Just in case some people do not want to know the ending yet).
A group of men with guns busted in the middle of the night while the monks were sleeping. The monks were taken hostage. One of them (the oldest monk - the one that helps the doctor) hid under his bed and was not taken. When the monks were quietly taken away, the monk under the bed came out and another monk joined him.
The hostage takers made the monks say their names and status to a recorder. The head monk was made to read something about being hostages in exchange for comrades that were in prison.
The last shot was the monks and the gun men walking up the snowy forest in line. They disappeared in the fog.
Then words came on the screen stating that the monks were killed but that killers were never identified.