CIUDAD JUAREZ, Mexico — Mexican prosecutors say they are looking into claims that a woman who killed two bus drivers last week in this northern border city was seeking revenge for alleged sexual abuse of female passengers.
The claims made over the weekend in an e-mail from the self-styled ‘‘bus driver hunter’’ echoed deeply in Ciudad Juarez, which has a grim history of sexual violence against women aboard buses.
A woman wearing a blond wig — or dyed hair — boarded one of the school bus-style vehicles that serve as transport in Ciudad Juarez on Wednesday morning. She approached the driver, took out a pistol, shot him in the head, and left the bus. The next day, apparently the same woman did the same thing to another driver on the same route.
Over the weekend, media outlets began receiving e-mails from the address ‘‘Diana the hunter of bus drivers.’’
‘‘I myself and other women have suffered in silence but we can’t stay quiet anymore,’’ the e-mail said. ‘‘We were victims of sexual violence by the drivers on the night shift on the routes to the maquilas,’’ a reference to the border assembly plants that employ many residents in Ciudad Juarez, across the border from El Paso, Texas. ‘‘I am the instrument of vengeance for several women.’’
The newspaper Diario de Juarez reported that a witness quoted the killer as telling the second victim, ‘‘You guys think you’re real bad, don’t you?’’ before shooting him.
Authorities have not verified the authenticity of the e-mail, or of a Facebook page set up under a similar name Aug. 31.
But Arturo Sandoval, spokesman for the Chihuahua state prosecutors’ office, said Monday the vigilante claim is considered one of the working hypotheses in the crimes. There was no apparent robbery involved in the killings.
The government said it will put undercover police aboard some buses and conduct weapons searches to prevent further killings, adding that a citywide search for the suspect is underway.
‘‘We have a police sketch of the suspect and we are looking for her,’’ municipal police spokesman Adrian Sanchez said.
Many of the women killed during a string of more than 100 eerily similar slayings in Ciudad Juarez in the 1990s and early 2000s disappeared after boarding buses. Their bodies were often found weeks or months later, raped, strangled, and dumped in the desert or vacant lots.
Several bus drivers were arrested in connection with those killings, but the cases against them always appeared weak or their confessions coerced. One driver had his conviction overturned, and his codefendant, another bus driver, died in prison before sentencing.
The head of the Chihuahua Women’s Human Rights Center, Lucha Castro, said that perhaps the killer ‘‘or someone close to her suffered some abuse by one of these guys.’’
‘‘It’s a fact that there are sexual abuse cases on the bus routes, but it’s no greater than women disappearing from the streets in downtown, in human trafficking rings,’’ Castro said.
But, she added, like the still-unresolved identities of most of the 1990s killers, ‘‘The most tragic thing is that the public may never know what the truth is.’’