Guangzhou Customs officers have seized 31 foreign suspects since October in a campaign targeting increased drugs smuggling by parcels and mail.

Arrests of foreign drug smugglers increase every year, officials said. They come mainly from Africa and South Asia.

Officers solved 50 cases, dismantled seven gangs and seized 106 kg of drugs and 42 suspects, said Luo Yinbo, deputy chief of Guangzhou Customs on Thursday.