The East Turkestan Islamic Movement was a "behind-the-scenes" supporter of this week's attack on Beijing's Tiananmen Square, China's top security official Meng Jianzhu said. "Its behind-the-scenes supporters were the terrorist group the East Turkestan Islamic Movement based in central and west Asia," Meng said when asked about the Tiananmen incident on a visit to Tashkent in Uzbekistan, video posted online Thursday showed.