KABUL (AFP) -- Two British nationals have been arrested in Afghanistan for posing a threat to national security, Afghan officials said Tuesday.

""They are British and were arrested five days ago,"" a government official who asked not to be identified told AFP. This was confirmed by another official who also did not want his name used.
The British embassy said it could not comment on the announcement.
One of the officials said the men were suspected of helping Taleban insurgents with weapons and money but this was not confirmed separately.
Afghan President Hamid Karzai's chief spokesman Homayun Hamidzada earlier told a news conference that two ""high-ranking foreign officials"" had been arrested.
""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,"" a senior official told AFP on condition of anonymity.
They would be expelled and their Afghan colleagues would go through a judicial process, he said.
The Foreign Ministry confirmed there had been arrests but said it would not immediately release details.
Multibillion-dollar development efforts in Afghanistan have been hampered by a Taleban-led insurgency that has gained pace over the past two years.