Afghanistan’s Taliban authorities have arrested at least 18 staff of an international NGO, including an American woman, accusing them of carrying out Christian missionary work, the country’s leaders said Saturday. The International Assistance Mission (IAM) confirmed its staffers were picked up from its office in Ghor province, central Afghanistan, and taken to Kabul. Security and intelligence forces had been observing the group for some time, Abdul Wahid Hamas Ghori, a government spokesman for the province, told AFP. “Documents and audios were obtained that showed they were inviting people to join Christianity,” he said, without providing further details. He said 21 people were arrested, including an American woman. IAM said in a statement earlier that 18 people, including a “foreigner”, were being held and that it had no information about the nature of the allegations. The American woman and two Afghan staff were the first to be detained on September 3, followed by 15 more Afghan employees on Wednesday. “Should any charges be lodged against our organisation or any individual staff member, we will independently review any evidence presented,” it added. IAM’s website says the organisation is founded on Christian values, but that it does not provide aid according to political or religious belief. “We value and respect local customs and cultures,” the Swiss-registered group said in a statement on Saturday.