State police were “working around the clock” Monday to locate a 33-year-old man accused of kidnapping and raping a woman at knifepoint in New Bedford last year.

Carlos Vizcaino, who has used several aliases and different Social Security numbers, has been added to the State Police Most Wanted Fugitives list, police announced.

He’s accused of holding a woman against her will for several hours, and sexually and physically assaulting her last May in New Bedford. The woman and Vizcaino were known to each other.

Troopers assigned to the State Police Violent Fugitive Apprehension Section and New Bedford Police were trying to locate Vizcaino, who police said was actively trying to evade law enforcement.

Police obtained a warrant from New Bedford District Court charging Vizcaino with armed kidnapping with sexual assault; rape with threat of bodily injury; and assault and battery with a dangerous weapon.

In the early morning hours of last May 31, New Bedford police responded to a report of a naked woman running from a vehicle. Officers found the victim with injuries, and she was taken to a local hospital.

The woman had escaped from Vizcaino’s vehicle, where the assaults had occurred, police said. She ran toward a stranger’s car. Vizcaino drove away, and the stranger called police.

Vizcaino is a Dominican Republic native, but has previously said he’s from Puerto Rico, according to police. Some of the aliases he has used include: Luis Castro, Angel Maysonet, Luis Linares and Carlos Vizcano. He has used various dates of birth and Social Security numbers with his aliases.

“Troopers often encounter suspects who use multiple identities in an attempt to evade law enforcement or take other steps in an attempt to hide their true identities,” State Police spokesman David Procopio wrote in an email Monday afternoon.

Vizcaino is about 5 foot, 7 inches tall and weighs 185 pounds. He’s Hispanic and has black hair and brown eyes.

He has tattoos on his upper left arm and right shoulder, and scars on his forehead. He has ties to Lynn and Lawrence — as well as to New Hampshire, Rhode Island and Pennsylvania.

In addition to the charges in New Bedford, Vizcaino has four other Massachusetts warrants for various motor vehicle violations issued out of the Lynn, Lawrence, Framingham and Plymouth district courts.

Vizcaino has used a New Hampshire license under the name Angel Maysonet during a prior interaction with police in Salem, N.H., according to police. He has also used a Rhode Island license under the name Luis Castro and other identification under the name Luis Mateo Castro Linares during a previous interaction with law enforcement in East Providence, R.I., police said.

Anyone who sees Vizcaino or has information about him or his whereabouts is urged to call 911 or the State Police Violent Fugitive Apprehension Section at 1-800-KAPTURE (1-800-527-8873).