In this July 7, 2009 file photo, a Uighur woman faces off Chinese paramilitary police in Urumqi, China. A U.S. group that monitors militant Web sites said an offshoot of a secessionist group with ties to al-Qaida is threatening revenge Thursday, July 16, 2009 on China for the deaths of Muslim Uighurs in clashes this month.(AP Photo/Ng Han Guan, File)