Two of the four Americans kidnapped in Mexico have been found dead, while the other two have been found alive, according to Mexican President Andrés Manuel López Obrador.

The American citizens crossed into Matamoros, in the northeastern state of Tamaulipas just south of Brownsville, Texas, in a white minivan with North Carolina plates on Friday, the U.S. Embassy in Mexico City said Sunday.

"Shortly after crossing into Mexico, unidentified gunmen shot the passengers of the vehicle," the embassy said. "The gunmen herded the four U.S. citizens into another vehicle and fled the scene with them."

The Mexican president said one of those found alive was injured.

The four Americans were identified as Zindell Brown, Eric James Williams and cousins Latavia "Tay" McGee and Shaeed Woodard.

McGee's mother, Barbara Burgess, told ABC News that her daughter traveled from South Carolina to Mexico for a cosmetic medical procedure.

This is a developing story. Please check back for updates.