A one-year-old American girl was shot in the back by Mexican soldiers in the volatile border state of Tamaulipas, authorities said.
Her family's car apparently was caught between a vehicle carrying suspects and a pursuing military patrol, said Guadalupe Salinas, head of the federal prosecutor's office in the area.
An eight-month-old baby was grazed by a bullet, and a woman suffered wounds from glass or ammunition fragments, Salinas told the Associated Press.
None of the injuries were life-threatening and the toddler is being treated at a hospital in El Paso, Salinas said.
The soldiers were following an SUV, and at that moment they (the family) got in the middle," Salinas said.
"They (the soldiers) thought they were the bad guys. They got to the car and realized that no, it was women and children."
The incident happened last week, but was not confirmed by authorities until Wednesday.
The area has been terrorized by warring drug syndicates, authorities said. The Gulf Cartel is at war with the rival Zetas for control of the northern Mexican state, which contains several smuggling routes into the United States.
The family and their hometown have not been identified.