The man accused of stabbing at least five people in a machete rampage at the home of a Hasidic rabbi during a Hanukkah celebration pleaded not guilty to federal hate crime charges.

A federal grand jury indicted Grafton Thomas, 37, with additional counts of hate crimes for the 28 December stabbing of members of the Orthodox Jewish community in Monsey, New York, bringing the number of federal charges he faces to 10.

Each count carries a maximum prison term of life.

Mr Thomas attended his arraignment in White Plains, a suburb north of New York City, in orange jail fatigues as members of his family sat in the courtroom and waved at him.

He spoke only briefly to answer the judge's questions, confirming his name and age and saying that he has taken the drug Prozac.

Federal prosecutors have said Mr Thomas targeted his victims because of their Jewish faith.

In a criminal complaint filed last month, they cited journals they seized from the suspect's home containing references to Adolf Hitler, Nazi culture and the Black Hebrew Israelites movement, identified by extremism experts as an anti-Jewish hate group.

Mr Thomas also faces state charges for the attack, which his attorney, pointing to his client's long history of mental illness, has said was likely an expression of psychosis rather than bigotry.

The Monsey attack capped a string of incidents in which Jews have been physically attacked or accosted in the New York metropolitan area in recent weeks, including a shooting at a kosher supermarket in New Jersey that left two members of the Hasidic community dead.

One of the suspects in that attack - who died in the shooting - had also expressed interest in the Black Hebrew Israelites.

The most recent national numbers from the Anti-Defamation League's Center on Extremism found 780 anti-Semitic incidents reported to or detected by the organisation in the United States in the first half of 2019, compared with 785 incidents reported for the same period in 2018.