Rescue personnel stand on rubble next to a tilted staircase, part of a control tower which collapsed after a cargo ship slammed into it during a shift change Tuesday night in the port of Genoa, northern Italy, killing at least three people, Wednesday, May 8, 2013. Four others were hospitalized and a half-dozen people remained unaccounted for, including some feared trapped inside the submerged elevator of the control tower, officials said. By Wednesday morning, all that was left of the control tower was the mangled exterior staircase, tilted to its side. The tower itself, which was located on the very edge of a dock jutting out into the harbor, was either in the water or in a heap of wreckage on the dock. (AP Photo/Francesco Pecoraro)

Associated Press
Rescue personnel stand on rubble next to a tilted staircase, part of a control tower which collapsed after a cargo ship slammed into it during a shift change Tuesday night in the port of Genoa, northern Italy, killing at least three people, Wednesday, May 8, 2013. Four others were hospitalized and a half-dozen people remained unaccounted for, including some feared trapped inside the submerged elevator of the control tower, officials said. By Wednesday morning, all that was left of the control tower was the mangled exterior staircase, tilted to its side. The tower itself, which was located on the very edge of a dock jutting out into the harbor, was either in the water or in a heap of wreckage on the dock.  (AP Photo/Francesco Pecoraro)
Rescue personnel stand on rubble next to a tilted staircase, part of a control tower which collapsed after a cargo ship slammed into it during a shift change Tuesday night in the port of Genoa, northern Italy, killing at least three people, Wednesday, May 8, 2013. Four others were hospitalized and a half-dozen people remained unaccounted for, including some feared trapped inside the submerged elevator of the control tower, officials said. By Wednesday morning, all that was left of the control tower was the mangled exterior staircase, tilted to its side. The tower itself, which was located on the very edge of a dock jutting out into the harbor, was either in the water or in a heap of wreckage on the dock. (AP Photo/Francesco Pecoraro)
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