Website NewsJiegu, China (CNN) -- Unstable bridges and collapsed roadways kept rescuers and their heavy equipment away Thursday from Jiegu, China -- the town nearest the epicenter of a 6.9 magnitude earthquake that killed nearly 600 people and injured thousands more.Twenty-four hours after the Wednesday quake, most of Jiegu's dead were in the dusty rubble of a hotel that crumbled under the strain of the initial quake and a series of strong aftershocks. Residents painstakingly picked through the debris with shovels and ropes, ever mindful that time is a formidable obstacle to finding survivors.