URUMQI, China (AP) — China's embassy in Algeria has warned Chinese companies and workers to be on guard for attacks after an Islamist Web site called for retaliation for Beijing's response to unrest in its predominantly Muslim western province. A notice posted late Tuesday on the embassy's Web site follows a torrent of ethnic clashes this month that left at least 184 dead in Xinjiang's capital of Urumqi. Riots by Muslim Uighurs and subsequent fighting between Uighurs and members of the Han Chinese majority were the worst ethnic violence China has seen in decades. http://www.google.com/hostednews/ap/article/ALeqM5j794twyjYyjeOIdsKWwzCUhsgvUAD99ELHMG0