A water main break was reported shortly before 5 a.m. on Sunday under the 1000 block of Morena Boulevard, according to San Diego officials. The break created a large sinkhole in the street. Mud and water could be seen flowing down the road. Officials said some businesses in the area were flooded by the break. San Diego police blocked off the eastbound lanes of travel and set up a detour to allow city water crews to repair the area.