POLICE swooped on a showbiz rave party in Chai Wan early yesterday morning and arrested seven people suspected of drug offences as an official clampdown on party drug-taking moved into full swing. Among those arrested was Gilbert Yeung Kei-lung, the son of Emperor Group tycoon Albert Yeung Sau-shing. The licensed 'Pink Rave Party' was attended by several movie and pop stars. The arrests came just days after officials, police and rave organisers said they would step up the anti-drug message at parties. All seven, aged between 26 and 39, were allegedly found in possession of ketamine and marijuana and were released on bail ranging from $1,000 to $3,000. Meanwhile, a survey has found that more and more youngsters are taking drugs at discos and parties, with more than 70 per cent admitting they used narcotics. The survey was undertaken by the Hong Kong Playground Association, which interviewed 260 people aged between 12 and 24. Of the 40 per cent who were regular disco and party-goers, 73 per cent said they had taken drugs. More than 80 per cent said they had been lured to take drugs at discos and rave parties. Nearly 62 per cent said they mostly took Ecstasy, marijuana and ketamine, with about 50 per cent obtaining drugs from friends and gang members. Association social worker Siu Yau-hung urged the Government to introduce a licensing system for rave parties and to restrict access to children under 18: 'It is high time the Government executed the licensing policy, as taking drugs will not only damage youngsters' health. [It] will also lure the youngsters to work for triad members who offer them drugs.' Speaking after a meeting yesterday, acting Secretary for Security Raymond Wong Hung-chiu disagreed, saying: 'As long as the party organisers can work closely with the police and notify them once a drug problem is found, there is no need to license party organisers.'