Hong Kong: Britain's Foreign Office said Tuesday it was "extremely concerned" by reports that a Hong Kong consulate employee had been detained by mainland Chinese authorities on his way back to the city.
The Hong Kong consulate refused to confirm the man's name or further details of the apparent incident.
But reports in local news outlet HK01 said the consulate employee had failed to return after travelling to Shenzhen in Guangdong province, an hour outside Hong Kong, for a one-day business meeting on August 8.
"We are extremely concerned by reports that a member of our team has been detained returning to Hong Kong from Shenzhen," a Foreign and Commonwealth Office spokesperson said in a statement.
"We are providing support to his family and seeking further information from authorities in Guangdong Province and Hong Kong," it added.
The incident comes as the financial hub is facing its worst political crisis in decades.
Pro-democracy protesters have staged weeks of rallies that have often descended into violent clashes between police and protesters.
The demonstrations were triggered by a controversial extradition law but have broadened into a call for wider democratic reforms.
China had promised to respect the freedoms in the semi-autonomous territory after its handover from Britain in 1997.
Hong Kong enjoys liberties unseen on the mainland, including freedom of speech, unfettered access to the internet and an independent judiciary.