CIUDAD JUAREZ, MEXICO (AP) -- Mexican and U.S. authorities are probing the killings of four U.S. citizens who were shot in Ciudad Juarez over the weekend.
The Chihuahua state prosecutor's office says U.S. authorities arrived in Ciudad Juarez, across the border from El Paso, Texas, last night.
Office spokesman Arturo Sandoval says he couldn't reveal which U.S. authorities are involved because of the ongoing investigation.
But he said two of the victims, 26-year-old Giovanna Herrera and 15-year-old Luis Araiza, had criminal records. He would not specify what offenses.
The two were shot Saturday along with a Mexican man traveling with them just after they crossed an international bridge from El Paso.
Edgar Lopez of El Paso was killed Sunday along with two Mexican men when gunmen opened fire on a group standing outside a house.
Authorities also identified a 24-year-old woman killed Friday inside a tortilla shop as Lorena Izaguirre, a U.S. citizen and El Paso resident.
A Mexican man was also found dead in the store.
Ciudad Juarez has become one of the world's deadliest cities amid a turf war between the Sinaloa and Juarez drug cartels.
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