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Mexico City, Mexico (CNN) -- The Chihuahua attorney general's office said Friday it is investigating whether the car in which two photojournalists were shot Thursday in northern Mexico belonged to a human-rights activist who may have been the intended target. A photographer for El Diario newspaper in Ciudad Juarez was gunned down Thursday, the paper said on its website. A second photographer was wounded in the shooting. Luis Carlos Santiago, 21, was declared dead at the scene. He and his 18-year-old co-worker, Carlos Manuel Sanchez, were inside a silver Nissan sedan in the parking lot of a shopping mall, the newspaper said. Santiago was in the driver's seat.

Drug cartels pressure journalists and editors in
Mexico to avoid reporting on them and to print unflattering stories about rival drug cartels.