According to a NYPD spokesperson:
On Sunday at approximately 0341 hours a 35 year-old male informed police that he was inside of 560 Main Street in a stairway when he suffered multiple cuts, slashes and stab wounds by an unknown cutting instrument on his left arm, stomach, and chest. Suspect is male and known to victim. There are no arrests and the investigation is ongoing.
Wanted: for an Assault that occurred on 10/1/17 inside of 560 Main St, if you have any info 718-626-9311 or 911 pic.twitter.com/s67l2FNVhiNYPD 114th Precinct (@NYPD114Pct) October 2, 2017
Click here from more info. The Roosevelt Island Public Safety Department Incident Report described the assault as follows:
10/01/17 0343 560 Main Street Assault PSD/NYPD/EMS responded Transported to Hospital.