BEIJING, Jan 4 (Xinhua) -- The Ministry of Public Security said on its Web site Sunday that antidrug organizations across China made "obvious achievements" last year in stopping drug sources and improving rehabilitation methods.

    The ministry said antidrug forces cracked about 55,000 criminal cases in the first 11 months of last year and detained 65,000 suspects based on China's antidrug law.

    About 3.9 metric tons of heroin was confiscated and around 1300groups were suppressed for making or dealing drugs.

    A total of 17 professional rehabilitation centers have been built across China so far, the ministry said, adding the centers now emphasize the welfare of addicts so as to prevent them from relapse after giving up drugs.

    Antidrug forces also enhanced cooperation with international counterparts on digging out overseas drug sources, said the ministry.