Eight Hong Kong democracy activists detained in China last year for illegally crossing the border were due back in the city on March 22 after completing jail terms, in a case that drew international attention and concern over their treatment.
They were among 12 activists whose boat was intercepted at sea by mainland authorities in August 2020 allegedly en route to the democratic island of Taiwan.
All had faced charges in Hong Kong over the pro-democracy protest movement and are expected to be taken directly into custody on their return.
Among the eight is Andy Li, arrested under a sweeping national security law Beijing imposed on the Asian financial hub in June 2020 that critics say is aimed at crushing dissent.
In December, a Chinese court sentenced 10 of the 12 to between seven months and three years in jail. Defendants Tang Kai-yin and Quinn Moon, who were sentenced to three and two years, respectively, remain in Shenzhen.
Two minors who were among the 12 pleaded guilty to illegally crossing the border and were returned to Hong Kong in December.
During the detention of the 12 in the southern Chinese city of Shenzhen, mainland authorities denied their families and lawyers access, insisting they be represented by officially appointed lawyers, provoking criticism from rights groups.
Pro-democracy activists began fleeing Hong Kong for democratic Taiwan from the early months of the protests in 2019, most of them legally by air, but some by boat, activists in Taipei have told Reuters.
Hong Kong, a former British colony, returned to Chinese rule in 1997 with the guarantee of freedoms not seen on the mainland, including freedom of speech and assembly.
Democracy activists complain that Communist Party rulers in Beijing are whittling away at those freedoms, a charge China rejects.
Since Beijing imposed the national security law on Hong Kong, scores of democracy campaigners have been arrested, some elected legislators have been disqualified and others have fled overseas.