Chinese police seized 27.7 tonnes of drugs ranging from heroin to ketamine in 2009 as the country stepped up its fight against drug dealers, the National Narcotics Control Commission (NNCC) said Friday.

Chinese police confiscated 5.8 tonnes of heroin, 1.3 tonnes of opium, 6.6 tonnes of crystal methamphetamine, commonly known as "ice", 5.3 tonnes of ketamine, 8.7 tonnes of marijuana and 1.06 million ecstacy pills last year, according to the annual report on drug control released by NNCC.

Chinese police cracked down on 77,000 cases of drug-related crimes and detained 91,000 criminal suspects last year, it said.

The report also showed that some 173,000 drug addicts were forced to receive treatment in 2009 while 68,000 former addicts had stayed off drugs for more than three years.

NNCC has been releasing annual report on drug control since 1998 and this year's report is the 12th of the kind.