Two persons climbed halfway up the 200-ft. Crane on the Mather House construction site for unknown reasons around midnight yesterday.
The pair, a man and a woman, came down from the crane after appeals from the University Police, and Cambridge police and firemen on the scene, police said.
A patrol car reported seeing a third person atop the crane after the pair descended, but after watching and calling for half an hour, the police decided the object was a rag. The patrol cars and hook and ladder truck then went their ways.
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