An American serial killer who brutally killed at least three prostitutes in Mexico is on the run after he slipped back across the border into San Diego, California.

The suspected serial killer, whose name hasn’t been released by the authorities, allegedly picked up several sex workers in bars and clubs in Zona Norte, Tijuana, Mexico. Zona Norte is a red-light district along the border known for licensed sex workers and strip clubs. He then lured the sex workers to local motels where he had sex with the workers, brutally beat them, and killed them, New York Post reported.

The officers are investigating at least three murders in connection with the suspect. However, Baja California Attorney General Ricardo Carpio said that he believes the killer may have more victims.

According to Carpio, after committing the murders, the suspect is believed to have crossed back into the US in San Diego, California at an unspecified time and is believed to be hiding somewhere in San Diego. Carpio stated that an arrest warrant has been issued for the suspect and that investigators are working with their U.S. counterparts to track him down at the earliest, Fox News reported.

“If someone threatens the lives of our citizens, of our women, then they will have a serious problem with our justice system,” Carpio said.

"We have also taken the necessary actions to try and identify any cases that may be related to this femicide, and we have issued an arrest warrant against the said individual," Carpio said. 

Carpio stated that an investigation revealed that the suspect targets vulnerable, lonely victims and lures them with his lies before brutally murdering them.

“There was work done regarding sharing information between our homicide department and the institution’s strategy department,” the prosecutor said. “They were able to determine that this suspect attacks vulnerable, lonely victims and lures them with lies.”

Information regarding which US agencies were involved in the investigation is currently unclear. Authorities also haven’t disclosed details of the specific victims or the circumstances of their death.

“Without a doubt, we will capture him and transport him back here to Tijuana,” Carpio said.