Police have identified a suspect in the sexual assault and robbery of a German tourist, and they allege he was involved in two other recent robberies in Manhattan. NY1's Shannan Ferry filed the following report.

Police say 28-year-old Keon Robinson is a violent sex offender on the loose. 

Police named the Brooklyn man on Monday as a suspect in the mugging and sexual assault of a German tourist last week. They also said he is suspected in two other recent robberies. 

"We consider him a highly dangerous individual," said NYPD Chief of Detectives Robert Boyce. "He knows we're looking for him."

Robinson allegedly put a female tourist in a headlock last Thursday near West 146th Street. Police say he told her, "Give me your bag. I have a gun," before beating and sexually assaulting her.

Police say he injured his hand while punching the victim and left a trail of blood.

"We do a video canvass and we see him every step of the way walking with the bag and moving his hand like this," Boyce said.

Police revealed they also believe Robinson committed two other recent crimes. The first one was on April 24 near Bradhurst Avenue, when they say he approached a woman and allegedly said, "This could be easy. I have a gun. Just give me your bag." 

Authorities say the victim screamed, and Robinson punched her several times before taking off with her purse. 

Police say three days later, on April 27, he approached an Asian male on West 139th Street and said, "I will not hurt you if you give me the money." The victim gave him $40 and the suspect fled the scene.

"Robberies are down almost 12 percent around the city. This is unusual for us. And in that precinct, it's down 11 percent. So this is, it kind of like jumps out," Boyce said.

Robinson is a level 3 sex offender and was arrested in 2007 for robbery and sexual assault. He spent seven years behind bars, but was sent back to jail in 2016 after violating his parole. Robinson was just released in January.

Police say if you see Robinson, call 911. 

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.