Seven syringe needle attack groups have been captured as of Tuesday by the police force of the Xinjiang Uygur autonomous region.
Some 75 suspected syringe needle attackers have been apprehended, and more than 36 related cases have been cracked, said Zhang Jun, deputy director of Urumqi public security bureau, at a press conference Tuesday.
The serial syringe attacks, which are still haunting Urumqi residents, especially Han dwellers in the city, had begun to spread from Urumqi to other regions in Xinjiang, Zhang said.
Among the 36 cracked cases, 16 were found in Urumqi, where 197 people were killed in riots on July 5. Another 13 cases were in Hotan prefecture, two in Turpan, two in Kashgar, and one each in Changji, Aksu, and Altay.
The local police force has been supported by crime scene experts from across the nation, sent by the Ministry of Public Security. Due to these coordinated efforts, attack crimes are decreasing both inside and outside Urumqi, Zhang said.
One of the busted groups included eight needle attack suspects led by Tursunjianj Turdi, Urumqi police announced Tuesday.
This group had organized several secret meetings since August plotting needle attacks aiming to stir up hatred between people from different ethic groups. They stabbed people with sewing needles, safety pins and toothpicks to spread fear among people.
Police arrested all eight suspects by Sept 7 and they are currently under investigation.