Old man's 'attacker' has raised cane before

The goon who beat a 91year-old Manhattan man with a cane Friday has a history of unhinged behavior and has twice made bomb threats against his former high school, according to police sources.

Saul Nuñez, 19, was admitted to Bellevue Hospital for psychological evaluation Sunday — two days after he savaged nonagenarian Juan Llorens with a walking stick (pictured) on an Inwood sidewalk.

Police deemed him an emotionally disturbed person in March of this year while investigating a threat he allegedly made against his former school, Riverdale Kingsbridge Academy, sources said.

In that case, he posted to social media a photo of the school and a former teacher there — next to a picture of a bomb exploding, sources said.

Nuñez was suspended for a similar incident in 2014 while attending the school, but police did not deem either sick threat credible, and Nuñez was not arrested in either case, sources said.

He was, however, collared in 2011, but that case is sealed because he was a minor at the time, according to law-enforcement sources.

But he made more than threats Friday when he allegedly pummeled Llorens.

The victim was pushing a cart down the sidewalk on Broadway near his West 204th Street home at about 6 p.m. Friday when the assailant, who was wearing pajama pants and carrying a walking cane, clobbered the poor old man without provocation, according to witnesses and security camera footage.

Good Samaritans intervened, but the attacker fled before they could capture him. Nuñez was arrested Saturday on charges of felony assault and criminal possession of a weapon — the cane.

Nuñez clearly did not need the walking stick, said Good Samaritan Nelson Sosa, 27.

“He had a cane and I was thinking his leg must be bad, so when he ran as fast as he did I was surprised,” he said.