Two of the four Americans shot at and kidnapped by gunmen as they crossed into Matamoros, Mexico on March 3 are now back in the United States receiving medical care.
The two other Americans in the group were found dead according to Mexican and U.S. officials. Officials said the the two survivors experienced "serious" injuries.
Authorities in Tamaulipas state confirmed that at least one Mexican citizen was also killed in the shooting. The woman was 33-years-old and reportedly died after being hit by a stray bullet, Reuters reported.
Law enforcement in Mexico said they have started an investigation, including ballistics testing of casings and other details from the scene to search for clues to try and find those responsible for the killings and kidnappings.
Tamaulipas state Governor Américo Villarreal said police had arrested a man in his early 20s who was found guarding over the victims. It was unclear what charges the man faced. He was identified as "Jose Guadalupe N."
Neither the FBI, nor the Mexican Department of Justice in Tamaulipas state, immediately responded to a request for information on the suspect and his potential charges.
As the case of the kidnapped Americans receives national and international attention, some journalists in Mexico point out that killings in Mexico of Mexican nationals often don't spark the same kind of attention.
Mexican journalist Oscar Lopez, citing data from Mexico's Security Secretary, reported that 380 "malicious homicides" occurred last year in Northern Mexico's Tamaulipas state alone, situated along a large portion of the southern border with Texas. 18 kidnappings were recorded there in that same time period.
As Lopez and other journalists point out, across Mexico in 2021 alone, over 35,000 homicides occurred, according to government data. That's more than 90 Mexicans murdered each day.
The U.S. Department of State has warned against traveling to Tamaulipas because of "organized crime activity."
According to the U.S. government, murders, extortion, sexual assaults and gun battles are all "common" occurrences along Mexico's northern border.