A Hong Kong student activist group says one of its members has been detained at the city's airport apparently on suspicion of involvement in a violent Lunar New Year clash between police and protesters.

The group Scholarism said on its Facebook page that 22-year-old Derek Lam Shun-hin had been detained Wednesday morning shortly before boarding a flight to Taiwan with his family. It says Lam had sent a voice message to friends in the group saying he was being taken away for an investigation.

At least 61 people have been held over Monday night's clashes and police have vowed further arrests.

Activists angered over authorities' attempts to crack down on food hawkers in a crowded working class neighborhood held running battles with police into the early morning hours of Tuesday.