Marisol Valles, 20, who has a baby son, took over the job as police chief in the town of Praxedis G. Guerrero in October after two other job candidates dropped out following the assassination of the mayor and his son, Yahoo/AFP news
Valles "went to the United States along with two relatives and will seek asylum," the source told AFP.
Praxedis G. Guerrero is on the Rio Grande border with the United States some 65 kilometers (40 miles) southeast of Ciudad Juarez.
Valles decision to leave comes after another female police officer of another border town disappeared and believed to have been kidnapped. Her fate is still unknown .
The US-Mexican border towns have long been infiltrated by illegal drug dealers particularly in the areas near Ciudad Juarez and Sinaloa.
The on-going drug war in Mexico has reached an alarming stage . The US government has considered the deployment of the National Guard to contain violence that have caused the death of thousands in Mexico and in some US-Mexican border towns.
President Obama has just met with Mexican President Felipe Calderon
and vowed greater cooperation to combat drugs and arms smuggling and ease trade tensions as they sought to smooth over cross-border differences.
Since Calderon launched a war on the cartels in 2006, more than 36,000 people have been killed
, putting pressure on Mexico and the United States to beef up their response.
The worsening violence caused by drug cartel rivalries in Mexico and in US border towns have slowed down business in the affected areas as tourists and businessmen are concerned of their security