A police report said the gunmen approached Alfredo Hurtado, 41, directly and shot him several times Monday.
The cameraman worked for El Salvador's Channel 33 covering general news.
Police reported no possible motive for the shooting in Jardines de San Bartolo, a town just outside the capital of San Salvador. But investigators suspected gang members because the area has been plagued by turf wars between the Mara Salvatrucha and the Mara 18 gangs.
Paris-based Reporters Without Borders said Hurtado was shot 11 times, three of them in the head. It said the cameraman's family reported he had not been threatened.
The press freedom group urged authorities to solve the slaying. "El Salvador's extremely high level of criminal violence may account for it but, although gangs are active in the area, the police should not rule out other possibilities," it said.
