URUMQI, June 16 (Xinhua) -- Thirteen people were executed on Monday for terrorist attacks and violent crimes in northwest China's Xinjiang Uygur Autonomous Region. They were involved in seven cases and convicted of organizing, leading and participating in terrorist groups; murder; arson; theft; and illegal manufacture, storage and transportation of explosives, according to local courts in prefectures of Aksu, Turpan and Hotan. All death penalties have been approved by the Supreme People's Court, as required in China. The 13 planned attacks and killed police officers, government officials and civilians. They took innocent lives, caused huge property losses, and seriously endangered public security, according to local courts. In one case, three defendants -- Ehmetniyaz Sidiq, Abdulla Srepli and Gulam Eli-- were convicted of organizing and leading terrorist attacks on a police station, hotel, government office building and other venues, killing 24 police officer...