MEXICO CITY – Mexican Federal Police freed two kidnapped journalists held captive since last Monday in the northern part of the country by an organized crime group, officials said Saturday.

The two were in a group of four journalists who were intercepted last Monday in the La Laguna region, which includes areas in the states of Coahuila and Durango in northern Mexico. One of them, Hector Gordoa of Televisa, was released Thursday in good health.

In an operation based on intelligence work, the agents rescued the two journalists in the city of Gomez Palacio, Durango state, according to a communique from the Public Safety Secretariat, or SSP.

Those rescued were news cameramen Javier Canales Fernandez of Multimedios Laguna and Alejandro Hernandez Pacheco of Televisa Torreon.

The whereabouts of the other journalist, Oscar Solis, a journalist at the daily El Vespertino, has not been announced, nor was it stated whether any arrests were made in the operation.

The journalists were kidnapped after covering the rioting of inmates at a jail over the arrest of the warden, accused of allowing prisoners and guards to go out at night to kill members of rival cartels.

On Friday, Interior Secretary Francisco Blake Mora, in a message read to the media, demanded the release of the reporters kidnapped by organized crime.

“This is an attack on all our society,” Blake said.

Also in northern Mexico, unknown assailants threw a grenade from a moving car at the studios of the Televisa network in the northern city of Nuevo Laredo, without claiming any victims but damaging two vehicles, officials said.

The city government confirmed through its Twitter account on Saturday that on Avenida Republica in the Infonavit neighborhood, where the TV channel’s studios are located, there was “a situation of risk from a detonation.”

Shrapnel from the grenade damaged two vehicles (an SUV and a car) belonging to network employees and broke glass in the main door.

The managing director of the company in Nuevo Laredo, Eduardo Martinez, said that no one was injured and that only material damages occurred.

In the last 10 years some 70 journalists have been killed in Mexico and to date this year 10 have already been slain. In addition, since 2006 until now, 14 have been reported missing.