Photo detail

Photo by The Associated Press

Investigators approach the scene where a crane overturned onto a barge and into San Francisco Bay, seen from Clipper Cove on Treasure Island Thursday, Feb. 21, 2013, in San Francisco. A crane tipped over while working on the new eastern span of the San Francisco-Oakland Bay Bridge on Thursday afternoon, but there were no injuries and nothing leaked into the bay, authorities said. The crane was on a barge underneath the new span helping to remove a temporary support structure and was holding a piece of the structure when it fell around noon Thursday, according to bridge spokesman Andrew Gordon. Gordon said officials are investigating what caused the crane to tip over and whether the new span was damaged at all. The new bridge is expected to open over Labor Day weekend. It will connect Oakland to Treasure Island and replace the eastern span that was damaged during the 1989 Loma Prieta earthquake.