Apparently the two were part of a kayaking school. Police weren't sure of its name or the boaters' skill level.
The bridge installation is one of four freestanding waterfalls around the city, created by a Danish artist. The $15.5 million project is the city's largest public art project since "The Gates" in Central Park in 2005.
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On the Web:
Waterfalls: http://www.nycwaterfalls.org/