Kenyan police chief Joseph Boinnet confirmed the raid on the office in search of illegal immigrants.
"All the foreigners who were arrested at CGTN have been released after their documents were confirmed to be okay," he told Capital FM radio station.
CGTN, an international English-language television station, broadcasts across the globe, with major news centres in Nairobi and Washington.
Kenya last month began hunting down and arresting those illegally in the country after holding a 60-day exercise in which every foreigner was required to revalidate their permits -- a laborious process that can take up to eight hours.
Last week the interior ministry released a hotline number for members of the public to report illegal immigrants.
"It is extremely worrying that citizens are being encouraged to call a hotline to report cases of suspected undocumented migrants. This approach is likely to ignite xenophobia against foreign workers, refugees and asylum seekers," Amnesty International's regional deputy director Seif Magango said in a statement on Saturday.
China and Kenya maintain strong relations, with Beijing funding numerous infrastructure projects in the country.
China financed 90 percent of a $3.2-billion (2.8-billion-euro) railway linking Nairobi to the coastal city of Mombasa.
President Uhuru Kenyatta -- attending a two-day China-Africa forum in Beijing -- is expected to sign a deal for the financing of the second phase of the railway, which will link the Rift Valley town of Naivasha to Kisumu near the Ugandan border, costing a further $3.5 billion.
The project has increased concerns in Kenya over mounting debt to China.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)