The US has charged four Chinese nationals with visa fraud for allegedly lying about their membership of China's armed forces.
BBC News reports three are under arrest while the FBI is seeking to arrest the fourth, who is said to be in China's San Francisco consulate.
FBI agents have also interviewed people in 25 US cities who have an "undeclared affiliation" with China's military.
Prosecutors say it is part of a Chinese plan to send army scientists to the US.
BBC
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