Hong Kong (CNN) -- A connection to Xinjiang, a restive autonomous region in northwestern China, has emerged in the investigation into the jeep that plowed into crowds in Tiananmen Square on Monday, killing five and injuring at least 40. The incident, which has been identified as a terrorist attack, was "carefully planned, organized and premeditated," police said Wednesday on their official Weibo account online. Tuesday, police circulated a notice to hotels in Beijing related to a "major incident" listing names that suggested suspects belonged to the Uyghur ethnic group that comes from Xinjiang. The region has a long history of...