A 37-year-old man has pleaded not guilty to five counts of attempted murder following a stabbing spree at a rabbi's home during Hanukkah celebrations.
Grafton E. Thomas pleaded his innocence after he was arraigned today on those five charges and one of burglary.
His bail has been set at $5 million, around £380 million.
One person is fighting for life following the attack, while one of rabbi Chaim Rottenburg's children was also among the victims.
Authorities previously identified the suspect as a man from Greenwood Lake, New York, and said he was arrested in New York City's Manhattan borough after fleeing the crime scene.
It comes as New York City governor Andrew Cuomo branded the attack, which happened at around 10pm local time on Saturday, "terrorism" as he visited the scene.
Mr Cuomo told reporters: "This is terrorism, it is domestic terrorism.
"These are people who intend to create mass harm, mass violence, generate fear based on race, colour, creed."
Authorities have not provided a motive for the attack - though Mr Cuomo said it was an example of larger problems.
He said: "This is an intolerant time in our country.
"We see anger, we see hatred exploding."
Officers who detained the suspect were praised for their "quick response" to the "horrific attack", by City of New York police commissioner Dermot Shea.
The attack occurred at a party attended by dozens of people and followed a spate of anti-Semitic attacks in New York City and surrounding areas.
New York City's police department said its officers were stepping up patrols in heavily Jewish neighbourhoods, following a spate of anti-Semitic attacks.
New York Senator Chuck Schumer on Sunday called the bloodshed in Monsey an "act of pure evil".
President Donald Trump condemned the "horrific" attack.
In a Tweet on Sunday he said: "We must all come together to fight, confront, and eradicate the evil scourge of anti-Semitism."
