Quick reactions saved lives after a metre-long buzzsaw blade went flying from a construction site and across a footpath.
The brush with death happened as construction crew working to fix a broken water pipe in Manhattan hit something that snapped the blade off the tool, sending it spinning 30 metres in the air, NBC New York reported.
The blade caught a woman's leg, gashing her thigh, a witness said.
"I was on the right side of the sidewalk, suddenly everyone started yelling 'Get down, move!'" Matthew Bisi said. "It was just like crazy chaos. People screaming, all the construction workers."
"I just turned, kinda ducked, put my head down," he added. "Thing came flying right by my head, missed me by that much. You could hear it coming and it went right by me.
"It took [the woman] right down, gashes on the side of the thigh," he said.
Police said the woman suffered minor injuries.