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Media tycoon Jimmy Lai at the Next Digital offices in Hong Kong in June. Photo: Anthony Wallace/AFP via Getty Images

National Security Adviser Robert O'Brien said in a statement Monday night the Trump administration is "deeply troubled" by the arrest of Hong Kong pro-democracy activist Jimmy Lai on suspicion of "collusion with foreign powers."

Why it matters: The arrest Monday of the most prominent person under the new national security law that gives Beijing more powers over the former British colony comes amid heightened tensions between the U.S. and China.

Details: Lai has been bailed, per the BBC. The 72-year-old's son was also arrested, Lai's pro-democracy newspaper the Apple Daily reports

  • Mark Simon, an executive at the tycoon's media firm Next Digital, tweeted that police had gone to Lai's home after issuing search warrants before heading to Apple Daily's newsroom to conduct a search.
  • Hong Kong police said in a statement Monday they searched a building in Tseung Kwan O, where Apple Daily's headquarters are located. They said they had arrested seven people on suspicion of breaching the national security law.
  • "Offences include collusion with a foreign country/external elements to endanger national security," the police added.

What they're saying: "These reported arrests, following the recent action by the Hong Kong government to unjustly disqualify candidates and postpone the Legislative Council elections, are the latest violations of Beijing’s commitments to the Hong Kong people and the world," O'Brien said.

"These arrests are also a clear effort to intimidate pro-democracy and political opposition figures and suppress Hong Kong’s free and independent media, which have played  key roles in the city’s character and success."
— Excerpt from O'Brien's statement

Of note: Lai was among a group of activists arrested earlier this year on charges of holding illegal assemblies in August and October related to the massive pro-democracy protests that swept the Asian financial hub last year.

  • When the national security law was imposed by Chinese lawmakers in June, Lai told the BBC in response that it "spells the death knell for Hong Kong."

Go deeper: With new security law, China outlaws global activism

Editor's note: This article has been updated with new details throughout.

Go deeper

Trump bans Americans from investing in 31 companies with links to Chinese military

Photo: Kevin Frayer via Getty

President Trump signed an executive order Thursday prohibiting American companies and individuals from owning shares in any of the 31 Chinese companies previously listed as enabling the People’s Liberation Army, effective Jan. 11.

Why it matters: Many of these companies trade on U.S. exchanges and are sometimes purchased by American investors as part of mutual funds. It’s unclear what effect Trump’s latest sanctions could have on the markets.

In photos: Tokyo Olympics day 10 highlights

Puerto Rico's Jasmine Camacho-Quinn (L) wins ahead of USA's Kendra Harrison in the women's 100m hurdles final during the Olympic Games at the Olympic Stadium in Tokyo on August 2, 2021. Photo: Jewel Samad/AFP via Getty Images

Day 10 of the Tokyo Olympic Games saw Puerto Rico bag its first-ever track gold medal when Jasmine Camacho-Quinn beat American world record holder Kendra Harrison to win the women’s 100-meter hurdles Monday.

The big picture: There was better news for Team USA in the basketball, where the women's national team beat France 93-82 — meaning the Americans are entering the medal round undefeated as they go for yet another gold, Axios' Ina Fried reports from Tokyo. France still advanced to the quarterfinals as well.

Updated 1 hour ago - Sports

IOC: Belarus sprinter who sought refuge in Tokyo "safe"

Krystsina Tsimanouskaya of Belarus in 2019. Photo: Ivan Romano/Getty Images

Belarusian Olympian Krystsina Tsimanouskaya, who sought refuge in Tokyo, is in the care of Japanese authorities and the UN refugee agency is now involved in her case, an International Olympic Committee official told reporters Monday.

The latest: Officials in Poland and the Czech Republic have offered to help the 24-year-old sprinter, who refused national team orders to board a flight home after being taken to Tokyo's Haneda airport Sunday following her criticism of Belarusian coaches, per Reuters