The United States' top spy catcher says Chinese espionage agencies are using fake LinkedIn accounts to try to recruit Americans with access to government and commercial secrets.
William Evanina, the US counter-intelligence chief, told Reuters in an interview that intelligence and law enforcement officials have told LinkedIn, owned by Microsoft, about China's "super aggressive" efforts on the site.
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He said the Chinese campaign includes contacting thousands of LinkedIn membersat a time, but he declined to say how many fake accounts US intelligence had discovered, how many Americans may have been contacted and how much success China has had in the recruitment drive.
German and British authorities have previously warned their citizens that Beijing is using LinkedIn to try to recruit them as spies. But this is the first time a US official has publicly discussed the challenge in the United States and indicated it is a bigger problem than previously known.
Evanina said LinkedIn should look at copying the response of Twitter, Google and Facebook, which have all purged fake accounts allegedly linked to Iranian and Russian intelligence agencies.
"I recently saw that Twitter is cancelling, I don't know, millions of fake accounts, and our request would be maybe LinkedIn could go ahead and be part of that," said Evanina, who heads the US National Counter-Intelligence and Security Centre.
It is highly unusual for a senior US intelligence official to single out an American-owned company by name and publicly recommend it take action. LinkedIn boasts 562 million users in more than 200 counties and territories, including 149 million US members.
Evanina did not, however, say whether he was frustrated by LinkedIn's response or whether he believes it has done enough.
LinkedIn's head of trust and safety, Paul Rockwell, confirmed the company had been talking to US law enforcement agencies about Chinese espionage efforts.
Earlier this month, LinkedIn said it had taken down "less than 40" fake accounts whose users were attempting to contact LinkedIn members associated with unidentified political organisations. Rockwell did not say whether those were Chinese accounts.
"We are doing everything we can to identify and stop this activity," Rockwell told Reuters. "We've never waited for requests to act and actively identify bad actors and remove bad accounts using information we uncover and intelligence from a variety of sources including government agencies."
Rockwell declined to provide numbers of fake accounts associated with Chinese intelligence agencies.
LinkedIn "is a victim here," Evanina said. "I think the cautionary tale ... is, 'You are going to be like Facebook. Do you want to be where Facebook was this past spring with congressional testimony, right?'" he said, referring to lawmakers' questioning of Facebook CEO Mark Zuckerberg on Russia's use of Facebook to meddle in the 2016 US elections.
China's foreign ministry disputed Evanina's allegations.
"We do not know what evidence the relevant US officials you cite have to reach this conclusion. What they say is complete nonsense and has ulterior motives," the ministry said in a statement.