( CNN ) -- The deportations of thousands of Mexicans who have served time in U.S. jails into Ciudad Juarez , Mexico , are adding a deadly ingredient to an already volatile state of security , Juarez Mayor Jose Reyes Ferriz said . Juarez Mayor Jose Reyes Ferriz says street level drug dealers are responsible for most recent violence there . Turf battles between rival drug cartels , and between authorities and cartels , have made Juarez one of the world 's most dangerous cities . There were 305 drug-related killings in August , making it the deadliest month yet , according to the mayor 's office . Most of the recent violence has been committed by young street-level drug dealers who work for the Sinaloa or Juarez cartels , Reyes Ferriz said . Adding deportees from the United States , some with criminal records , worsens the situation , the mayor said . In the past 45 days , 10 percent of those killed in Juarez had been deported from the United States in the past two years , Reyes Ferriz said . `` We do n't have the statistics to know if they were criminals from the United States or not , '' he told CNN 's Rick Sanchez this week . `` We know they were deported from the U.S . Most of them come from U.S. jails . They end up in the city of Juarez , and that 's a problem generated for us , but also for the United States . '' Most deportees are simply Mexicans who crossed the border illegally , but some hardened criminals get involved with the gangs , which have networks in the United States , Reyes Ferriz said . But according to Immigration and Customs Enforcement , the U.S. agency that oversees deportations , the number of criminal deportees entering Juarez from El Paso , Texas , is not high . `` El Paso had the fewest removals among the other border areas '' in fiscal 2008 , ICE spokeswoman Leticia Zamarripa said . About 85,400 `` criminal aliens '' were deported from the United States to their homelands in 2008 , according to ICE . Of those deported through El Paso , about 6,800 were criminal aliens , Zamarripa said . The term refers to noncitizens who have been convicted of a crime in the United States . Illegal immigrants whose only violation is entering illegally are not classified as criminal aliens , Zamarripa said . Not all were Mexican , so not all left the United States by crossing into Juarez , she added . By comparison , 11,400 criminal aliens were processed through San Antonio , Texas , via the nearby Laredo international bridges , and 11,000 criminal aliens were deported through San Diego , California . The location of the deportation proceedings `` depends on bed space and operational availability , '' Zamarripa said . Reyes Ferriz wants deportees to be repatriated to the interior of Mexico instead of his city . The Department of Homeland Security is running such a program , involving deportees from Phoenix , Arizona . The deportation flights from Arizona to Mexico are happening because it is a high-traffic area for illegal immigrants , and because that 's where the government of Mexico agreed to the program . In a recent conversation , Homeland Security Secretary Janet Napolitano said the United States would work to give Juarez more details about who is being dropped off on its doorstep , Reyes Ferriz said . The 2009 death toll in Juarez was 1,421 as of Monday , the mayor 's office said , on pace to beat last year 's 1,600 killings . According to a report released last week by a Mexican watchdog group , Juarez , population 1.5 million , was the homicide capital of the world . It had an estimated rate of 130 killings per 100,000 people . By comparison , the homicide rate in New Orleans , Louisiana , by far the deadliest city in the United States in 2008 , was 64 homicides per 100,000 residents , based on preliminary FBI figures . CNN 's Mariano Castillo contributed to this report .
Some deportees get involved with gangs in Juarez , Jose Reyes Ferriz says . Comment: Mayor wants deportees repatriated to interior of Mexico instead of his city . ICE official says number of criminals deported to Juarez low compared to other areas .