Britain, which administered Hong Kong until a 1997 handover to China whose terms were agreed in a Joint Declaration between London and Beijing, expressed concern over Wong's arrest.

Lam also announced other measures including opening a platform for dialogue with society to try to address other deep-rooted problems

China reiterated on Wednesday that Hong Kong's protest resembled terrorism and more street clashes followed ugly and chaotic scenes at the airport two days ago, when protesters set upon two men they suspected of being government sympathisers.

The illegal gambling market in Asia flourishes with use of mobile platforms and cryptocurrencies.