Hong Kong (CNN) A Canadian employee of the International Crisis Group (ICG) has reportedly been detained by Chinese security services in Beijing, the nonprofit organization said Wednesday.

Michael Kovrig, a former Canadian diplomat who is the organization's northeast Asia senior adviser, has been working with the group since February 2017, the group's statement said.

ICG alleged that Kovrig had been detained on Monday night by the Beijing Bureau of Chinese State Security, calling for the Canadian's "immediate release."

"Crisis Group has received no information about Michael since his detention and is concerned for his health and safety," their statement said.

In a press conference Wednesday, Chinese Foreign Ministry spokesman Lu Kang refused to confirm or deny whether Kovrig had been detained.

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