Before Monday, 15 people, including teenagers, had been arrested under the new law, which has seen activists disbanding their organizations or fleeing the city.
The United States on Friday imposed sanctions on Hong Kong leader Carrie Lam and other officials for allegedly helping to curtail political freedoms in the territory, drawing mockery and condemnation from Beijing.
The arrest reflects that Hong Kong "wasn't intimidated" by sanctions, Global Times editor Hu Xijin said in a tweet.
Global Times is published by China's official Communist Party newspaper People’s Daily.
(Writer: Marius Zaharia| Editors: Shri Navaratnam, Lincoln Feast, Gerry Doyle)
Dapatkan update berita pilihan dan breaking news setiap hari dari Kompas.com. Mari bergabung di Grup Telegram "Kompas.com News Update", caranya klik link https://t.me/kompascomupdate, kemudian join. Anda harus install aplikasi Telegram terlebih dulu di ponsel.