Jesus Alfredo Guzman Salazar was kidnapped on Monday.
Mexican federal prosecutors Thursday took over investigations into the gunpoint kidnapping of a son of notorious drugs boss Joaquin "El Chapo" Guzman, officials said.
State prosecutors said in a statement they were handing evidence of Monday's abduction of Jesus Alfredo Guzman Salazar, 29, over to the federal authorities.
Government official Roberto Lopez Lara said separately that authorities were investigating the possible involvement of municipal police in the resort of Puerto Vallarta.
Police said Guzman Salazar -- one of Guzman's sons from his first marriage -- was abducted from an upscale bar in Puerto Vallarta early Monday along with five other men.
Authorities say they suspect the gunmen who seized them were from the Jalisco New Generation cartel, an upstart rival of jailed kingpin Guzman's Sinaloa cartel.
The governors of Jalisco and Sinaloa states, where the rival gangs are based, have warned of possible reprisals.
Security camera footage showed armed men bursting in and making their victims kneel down with their hands on their heads before taking them away.
"It was violent but cleanly done," the restaurant's owner Ignacio Cadena Beraud told reporters on Thursday.
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