Man Slashed Outside Shake Shack In Downtown Brooklyn, NYPD Says [Updated]

A man was viciously slashed in the arm by another man carrying a weapon outside the Shake Shack in Downtown Brooklyn Thursday afternoon, police said.

Witnesses said two middle-aged men in their 50s were arguing at the corner of Adams and Fulton Streets around 3 p.m. when 57-year-old Lacey Maxwell from Brownsville pulled out a knife and sliced the other man’s arm open, police said.

Officers rushed to the scene, putting the Shake Shack on lockdown and arrested the slasher on the spot, who also had heroin on him, authorities said.

A witness told the Brooklyn Daily Eagle that the victim suffered a 10-to-12-inch cut so severe he could see the man’s bone.

Cops tied shirts and a belt around the victim’s arm in an attempt to save his life, the witness said.

Emergency responders transported the victim to Methodist Hospital and is in critical condition, an NYPD spokesperson said.

Maxwell was arraigned on last Friday and charged with assault, criminal possession of a weapon and criminal possession of a controlled substance, police sources said.

Updated as of August 16, 2016, at 1:05 p.m.