Los Zetas are adamant about not being reported and cartel has been implicated in the deaths of many journalists.
The death of Camangyan and two other journalists prompted calls for immediate action, according to the Committee to Protect Journalists.
A conference last week commemorated the death of four journalists in Mogadishu last July.
The same day, the JNA bombed Ljubljana airport, causing the deaths of two Austrian journalists, and Slovenian troops claimed to have shot down six federal air force helicopters and one aircraft.
Beijing and Washington still cannot agree on how China should be compensated for the deaths of three Chinese journalists killed in the attack.
By some reckonings, the death of two journalists working for CBS News on Monday firmly secured the Iraq war as the deadliest conflict for reporters in modern times.
Irina Bokova, the director-general of UNESCO, condemned the deaths of four journalists from the previous week on 11 September 2010, which included Alberto Chakussanga.
But the commission also reported that the deaths of 16 journalists had gone unsolved because of insufficient investigation.
In 2007, Tedeschi was the Counsel Assisting the Coroner for the deaths of five Australian journalists at Balibo.
American soldiers have been responsible for the deaths of about 14 journalists in Iraq, the majority of them Iraqis.