Drug traffickers in the central city of Da Nang have switched their focus on methamphetamine and heroin from opium and marijuana over the last two years, a senior police officer told a press conference on drug prevention on Friday.

Lieutenant colonel Nguyen Xuan Cuong, Deputy Head of Counter Narcotics Office under the city's Public Security Department, said the number of traffickers caught with methamphetamine in 2012 was seven times more than the amount in 2011. 

Cuong added the city's narcotics police force last year arrested a total of 128 drug offenders with 921.4 grams of methamphetamine, 54 grams of heroin and 133.6 grams of marijuana extracts.

A report at the conference shows there are an estimated 1,500 addicts and drug users at rehabilitation centers across the city.