(CNN) -- Mexican authorities on Thursday continued to investigate the kidnappings of at least six people from a Holiday Inn in Monterrey, Mexico, Wednesday.
Nuevo Leon state Attorney General Alejandro Garza y Garza said in a news conference that the unidentified gunmen entered a second hotel as well, the state-run Notimex news agency reported.
A convoy of between 10 and 15 vehicles carrying as many as 30 gunmen pulled into the Holiday Inn at around 2 a.m., Garza y Garza said.
According to him, the gunmen brought a handcuffed man into the lobby, who gave them information on the intended victims.
A businessman from Mexico City, Luis Miguel Gonzalez, was kidnapped, along with three other guests, Garza y Garza said.
The other guests were identified as Angel Ernesto Montes de Oca of Mexico City, Manuel Juarez and Aracely Hernandez, an employee of a staffing company near the border with the United States.
A hotel receptionist, David Salas, was also kidnapped, together with another hotel employee, authorities said.
A security guard at the hotel was missing, but it was not confirmed that he too was kidnapped, Garza y Garza said.
Before leaving, the gunmen took the computer from the reception desk as well as the video from the security camera, he said.
Minutes later, there was a report of the same group of gunmen entering the Mision Hotel, located near the Holiday Inn. Police responded to the hotel, but the officials there declined to report a crime to the authorities.
Northern Mexico, particularly the states of Tamaulipas and Nuevo Leon, have seen a recent uptick in violent activity, much of it blamed on warring drug cartels.