There are published reports that part of a man's leg was found washed up along the East River near the FDR and Sixth Street.
Someone spotted the leg (from the knee down) around 11:30 a.m.
Per the Daily News:
It was not immediately disclosed if a foot was attached to the extremity, which was brought to the city Medical Examiner’s office. Further tests will be done to try to determine who the leg belonged to and how it became separated from the person’s body.
And via NBC 4:
Details remain scarce at this point, but an NYPD spokesperson said, "When you find a leg in the water, that's suspicious in itself."