Media advocacy group Reporters Without Borders says Mexico continues to be the most dangerous country for journalists.
The Paris-based group's annual World Press Freedom index says at least eight journalists were killed in Mexico in the 12 months since September 2006. It said authorities have not identified all those responsible for the murders.
Cases of violence against journalists were also reported in Argentina and Brazil, which ranked 82nd and 84th on the index. Peru set a record with nearly 100 journalists being physically attacked.
In Haiti, the report said the media only suffered a few physical attacks or abuse by authorities.
The report says the media is fairly free in Uruguay, Costa Rica and Panama.