One suspect hurt, heroin and other substances seized Guangzhou police have arrested four foreigners suspected of drug trafficking after a raid on a rented house in the Baiyun district. Officers fired warning shots and injured one suspect who tried to escape during the raid. Police also seized 7kg of heroin and quantities of new narcotics such as sublingual buprenorphine pills and hexagon, a drug five times more potent than Ecstasy, Southern Metropolis News reported, quoting security guards. Sublingual buprenorphine is used to help treat heroin addiction. Police did not respond to a request for confirmation and further information on the raid. It was suspected the four foreigners colluded with locals to bring the drugs into Guangzhou and sell them, the reports said, adding that there had been six cases this year. A drug trafficking ring has been set up with foreigners bringing drugs to Guangzhou via Shandong and Guangxi for their local counterparts to sell in Guangzhou, the reports said. Police this year have arrested 17 people including 15 from Africa for drug trafficking and seized more than 53kg of drugs from smugglers who came mainly from Southeast Asia and Africa. In one week in September, customs officers arrested seven African drug mules and two other drug couriers at Guangzhou airport. A rise in crime committed by foreigners has prompted calls for tighter control and management of Guangzhou's burgeoning expatriate population. There were believed to be 1.2 million foreigners registered with police for short stays in Guangdong last year and an additional 45,436 with long-stay residence permits. Guangzhou People's Political Consultative Conference delegate Wang Zhixiong said in a 2004 report that lack of co-ordination of the various departments controlling foreigners had resulted in an increase in crime and incidents involving expats. The problem was compounded by inadequate staffing and funding for police departments dealing with foreigners which made it impossible for them to fulfil their responsibility, he said. The system allows different departments to approve visas making it easier for foreigners to enter the country and to reside and work illegally.