Yengisar ( يېڭىسار , '' Йеңисар '' ) is known for the manufacture of Uyghur handcrafted knives — '' yingjisha '' ( 英吉沙刀 or 英吉沙小刀 ) in Chinese . Although the wearing of knives by Uyghur men ( indicating the wearer 's masculinity ) is a significant part of Uyghur culture , it is seen as an aggressive gesture by others . The Uyghur word for knife is '' pichaq '' ( پىچاق , '' пичақ '' ) , and the plural is '' pichaqchiliq '' ( پىچاقچىلىقى , '' пичақчилиқ '' ) . Limitations were placed on knife vending due to terrorism and violent assaults where they were utilized . Robberies and assaults committed by groups of Uighurs , including children sold to ( or kidnapped by ) gangs , have increased tensions . China has been working on multilateral anti-terrorism since the September 11 attacks and , according to the United Nations and the U.S. Department of State , some Uyghur separatist movements have been identified as terrorist groups .
September 11 attacks
September 11 attacks
Ethnic issues in China