Police in Beijing have arrested more than 30 foreigners suspected of drug crimes and confiscated 790 grams of drugs in a three-month campaign, the Beijing police bureau told Beijing Times on Monday.

The police intensified their investigation of illegal drug activities in areas including Sanlitun, where a large number of foreigners live and work, in early March, and detained more than 10 foreigners suspected of drug crimes.

The police broke multiple criminal gangs involved in drug crimes after interrogations and investigations. Most of the gang members were foreigners and most had brought drugs with them to Beijing from southern China, police found.