BEIJING (AP) — The 10,000 pigeons released in a ceremony Wednesday for China's National Day underwent unusual scrutiny, each having its feathers and anus checked for dangerous materials, state-run media reports said, reflecting government jitters over possible attacks. The notched-up security measures reflect heightened concern about violence following a string of attacks blamed on separatist militants from the country's ethnic Uighur Muslim minority, as well as bus explosions and random slashing attacks attributed to disgruntled individuals.