The man wanted for sexually assaulting and robbing a German tourist in Harlem last week is a level-three sex offender who was ID’d thanks to the trail of blood he left behind, cops said Monday.

Suspect Keon Robinson, 28, hurt his hand punching the ground before he ran off with the tourist’s tote bag, and cops followed his trail of blood to a building on West 147th Street, where he knew someone, said NYPD Chief of Detectives Robert Boyce.

Police found a bloody handprint in the elevator — which they are doing DNA testing on and expect to match to Robinson — as well as the suspect’s acquaintance, who ID’d him from the video surveillance, Boyce said.

Robinson is now being eyed in at least two other recent attacks, cops added.

“He’s a highly dangerous individual,” Boyce said at a press conference. “He knows we’re looking for him.”

Robinson did seven years in prison for robbing and trying to rape a woman along with his buddy in Brooklyn in 2006. He was released in 2014, then sent back to jail this past September for failing to register with the sex-offender registry — but got out again in January.

Boyce said that besides attacking the tourist May 4, he also is suspected in two other strong-arm assaults in Harlem – one on April 25 and another two days later.

The tourist was walking back to her Airbnb rental on West 146th Street near Frederick Douglass Boulevard at around 2:50 a.m. when the suspect stalked and attacked her, cops said.

Surveillance video showed the 5’ 6” suspect groping the victim before snatching a tote bag containing her passport and laptop.

When the woman reached to reclaim her property, her attacker struck her in the face and knocked her to the ground. He continued to punch her several more times as she lay crumpled against a pile of trash bags, hurting his hand in the process. He then sexually assaulted her.

The victim suffered broken teeth and other injuries.

Boyce said video captured Robinson fleeing the scene and heading into the nearby building.

On April 24, the same suspect approached a 35-year-old woman near 130 Bradhurst Avenue at around 4 a.m. saying: “This could be easy, I have a gun, just give me your bag,” police said.

As the victim screamed in terror, he punched her several times before snatching her purse.

On April 27, he approached a man near 701 139th St. at 1:40 a.m. and told him: “I will not hurt you if you give me your money.” After a brief scuffle, where the victim was put in a headlock, the suspect fled with $40 in cash.

Robinson was previously sentenced to seven years in prison for robbing and sexually assaulting a woman with the help of pal Justin Briggs back in 2006.

The two men, one of whom was armed, approached the victim inside a building at the Brevoort Houses in Brooklyn with bandanas over their faces before pulling her into a hallway and stealing her purse, according to court documents.

Robinson then held her against a wall and removed her blouse and pants before he and Briggs took turns fondling her, records show.

Robinson attempted to rape the victim, but he and Briggs fled with her property before completing the act.

He was released from prison in 2014.

Robinson was arrested last year when he failed to update his address with the NYPD, as required by the sex-offender registry. He had been living at a homeless shelter until moving out in June.

He went back to jail in September and was freed in January, records show.