The State Department has fired six employees at the U.S. embassy in Afghanistan for allegedly using or possessing prohibited drugs, a particularly troubling infraction given the years-long U.S. effort to eradicate opium production in the country.
A senior State Department official said those who were embassy employees were fired and others who were contractors were released from their contracts.
The official declined to say what led to the investigation, but the Wall Street Journal reported it was launched after a person was wandering about in a state of confusion.
A State Department official told VOA Thursday the fired workers "were found to have been using or in possession of prohibited substances."
Opium production in Afghanistan is a major source of income for the Taliban and other insurgents.
Afghanistan is the source of more than 90 percent of the world's heroin. Despite global efforts to stem the flow of narcotics, the United Nations says production reached near record levels in 2016.
The United States has spent more than $8 billion on drug interdiction in Afghanistan since the start of war against the Taliban in 2001.