PUERTO VALLARTA, Mexico, Aug. 18 (UPI) -- Mexican authorities said they haven't been able to identify one of six people kidnapped in Puerto Vallarta, and they can't rule out the possibility that person is a second son of drug lord Joaquin "El Chapo" Guzmán.
Authorities initially determined Jesús Alfredo Guzmán Salazar, 29, one of Guzmán's children, was among several kidnapped early Monday from the upscale La Leche restaurant in the Pacific coast city.
Jalisco State Attorney General Eduardo Almaguer told El Universal, though, that there is one person among the abductees who remains unidentified. Authorities have not ruled out it could be Iván Archivaldo Guzmán Salazar, Guzmán's 32-year-old son. Guzman is believed to have 18 children.
Among evidence that indicates Iván Archivaldo, whose birthday was Monday, may have been present are witnesses who say "Las Mañanitas," a traditional Mexican birthday song, was sung inside the restaurant before the abduction carried out by several gunmen carrying high-caliber weaponry.
Jesús Alfredo also made a social media post on Sunday in which he indicated that he was with his brothers -- specifically Iván Archivaldo who "has been like a father to me," he wrote in the post.
"Good little Sunday with my brothers. Now hopefully there were moments like this every day. Although things are ugly, not all the money in the world could pay like family. Family, brothers are ground gold," Jesús Alfredo wrote, translated from Spanish.
When asked if Iván Archivaldo was among the kidnapped, Almaguer said "he could not affirm."
"Of the elements we have and images we reviewed and diligence carried out, so far we have no elements to confirm or presume the presence of this person," Almaguer said.
Officials suspect the Jalisco New Generation cartel may be responsible for the kidnapping. A Mexican official told CNN that authorities are searching for the kidnapped men in the states of Jalisco, Michoacán, Nayarit and another that was not named.