And there are certainly places, like Ciudad Juarez or Tamaulipas state, I'd never visit now.
Neighbours gave police a description of Cardenas, who was arrested shortly afterwards in Ciudad Juarez.
Ciudad Juarez, on the Mexico-US border, is one of the world's most violent cities.
Peter's Square, a woman from Ciudad Juarez, Mexico, told CNN's Anderson Cooper she was thrilled.
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While working on a different project in Ciudad Juarez, I met with executives and politicians.
Olga Bashbush, spokeswoman for the U.S. consulate in Ciudad Juarez, declined to comment on Acosta's guilty plea.
"The situation in Ciudad Juarez is of special concern, " the State Department said in an alert last month.
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She will work with Ms Lopez Urbina on investigating the Ciudad Juarez killings.
"The situation in Ciudad Juarez is of special concern, " the alert said.
In Ciudad Juarez, more than 3, 000 people were killed in 2010 alone.
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More than 300 women were murdered in Ciudad Juarez in a wave of violence which started in 1993 and lasted for a decade.
The murder rate in Ciudad Juarez, which was widely seen as the world's murder capital in 2010, has been on a striking decline.
Ciudad Juarez is the most violent city in Mexico, with 3, 100 people killed in 2010 out of a population of more than a million.
In addition, all four bridges from Ciudad Juarez, Mexico, to El Paso were closed for a time Wednesday night due to a bomb threat.
Lawmakers and witnesses at the hearing universally applauded Calderon's efforts to deal with drug violence through actions such as sending troops into Ciudad Juarez.
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"The situation in Ciudad Juarez is of special concern, " it said.
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More than a third of the 2010 reported slayings of U.S. citizens occurred in the border cities of Ciudad Juarez and Tijuana, according to the State Department.
They carry out their work without the disturbance of the gruesome cartel violence that affects residents in more developed, industrial cities such as Ciudad Juarez and Monterrey.
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More than 250 women have been killed - a third of them also sexually assaulted - in Ciudad Juarez, close to the US border over the past decade.
At least 40 people have been killed in Ciudad Juarez since Friday, making it one of the most violent weekends in the city in years, Mexican officials say.
Ciudad Juarez, the Mexico border city known for its modern factories and strip malls and disturbing levels of cartel killings and street violence serves as an example throughout the book.
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Yakin Ertuk, a UN special rapporteur on violence against women, criticised what she called the impunity which prevailed around the murder of women, in Mexico, and in particular Ciudad Juarez.
The latest upsurge in violence in Ciudad Juarez saw 20 murders on Friday, 19 on Saturday and at least one on Sunday, a spokesman for the state attorney general's office said.
The group represents the families and friends of more than 300 women who were murdered in Ciudad Juarez in a wave of violence which started in 1993 and lasted for a decade.
The North America Free Trade Agreement went into effect in January 1994, opening Ciudad Juarez up to an influx of factories, for companies like Delphi, General Motors, Philips, RCA and General Electric.
In Ciudad Juarez a taskforce of thousands of federal army soldiers, federal police and municipal police patrol the streets under direct orders from the president of Mexico to bring the violence under control.
In northern Mexico, along the border, industrial cities have benefited from economic openness, and companies in places such as Monterrey and Ciudad Juarez are producing a variety of increasingly high-tech products for export.
An undocumented immigrant who was brought to the United States by her parents when she was 4, Olivas traveled to Ciudad Juarez, Mexico, last month to beat a deadline to apply for a visa.
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