The Afghan authorities have arrested two British nationals for allegedly posing threats to national security.
Homayun Hamidzada, chief spokesman for the Afghan president, on Tuesday said: "Two foreign officials have been arrested recently because they had posed threats to the national security of Afghanistan."
Hamidzada would not say what the pair were alleged to have done.
One government official told AFP news agency: "They are British and were arrested five days ago."
Another senior official said: "They, with support from their Afghan colleagues, had done things contrary to their jobs and had posed a threat to the national security of Afghanistan."
The foreign nationals would be expelled and their Afghan colleagues would go through a judicial process, he said.
Afghanistan's foreign ministry confirmed there had been arrests but said it would not immediately release details.