This is the best tl;dr I could make, original reduced by 65%. (I'm a bot)

> Chinese authorities have raided the Beijing office of US-headquartered due diligence firm Mintz Group and detained five staff.

> "We can confirm that Chinese authorities have detained the five staff in Mintz Group's Beijing office, all of them Chinese nationals, and have closed our operations there," the company said in a statement on Friday, the Reuters news agency reported.

> Reuters, citing an anonymous company source, had earlier reported that the office was raided on March 20 and the detained staff were being held incommunicado in a location outside of Beijing.

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