He was seen being escorted into a police vehicle without being handcuffed shortly after the arrest and was still being detained at police headquarters in Wan Chai last night. He had not been charged.

Sources told the Post that ­immigration officers at the airport alerted the police before the arrest.

The wounding case in question happened in ­January when a local businessman was injured.

It was understood that the blackmail cases happened ­between January and April when his alleged followers put up posters on the street.

The criminal intimidation case dated back to late last year.

Kwok became known to the public in 2012 when it was reported he attended a dinner with aides of Leung Chun-ying – who was then running for chief executive.

The dinner raised questions about whether Leung and his team were colluding with triads.

Leung and his supporters said they did not know Kwok and had not invited him, and the Independent Commission Against Corruption later called off an investigation into the alleged collusion.

On December 20 last year, Kwok was punched in the face by a man in a cafe in the ­Peninsula Hotel in Tsim Sha Tsui, in what was thought to be a dispute over his ­mistress and financial problems in his Macau business.

His close associate, an alleged Wo Shing Wo triad member known as “Pa Ki Ming”, was badly wounded in an ambush by eight gangsters in To Kwa Wan in April.