Watch the moment the cranes collapsed:
The probe was announced Tuesday, a day after two towering cranes parked on a floating pontoon toppled over as they were carrying a new section of a bridge and slammed into homes and shops in Alphen aan den Rijn.
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Rescuers who scoured the scene of devastation late into the night say they are confident that nobody remains buried under the wreckage.
In a statement, prosecutors say three people involved in the bridge restoration work voluntarily went to police and are being treated as possible suspects.
Story by the Associated Press.