Workers repair a cave-in area on a road in Xi’an, Shaanxi province May 27, 2012. The cause of the cave-in, measuring about 6 meters (20 ft.) in depth, 15 meters (49 ft.) in length and 10 meters (33 ft.) in width, is still under investigation. No casualty has been reported, according to local media. Picture taken May 27, 2012. REUTERS/China Daily (CHINA – Tags: SOCIETY DISASTER TPX IMAGES OF THE DAY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA – RTR32QIZ