Sanlitun, a bustling area in Beijing's Chaoyang district, has become the main area where foreign drug addicts and traffickers are arrested, according to the capital's No 2 People's Procuratorate.

From 2011 to March 2012, the prosecuting authority dealt with seven cases involving seven foreigners suspected of drug addiction or trafficking in the area, making up about 23 percent of all such cases, said a statement from the procuratorate.

Around 86 percent of the suspects were from North and East African countries, five had no jobs and the other two were exchange students in the city, the statement said.