"Rarely have reporters been murdered with such a barbaric sense of propaganda, shocking the entire world," Reporters Without Borders said.
66 journalists were killed this year, down from 71 in 2013, although the nature of the killings was troubling, the report said. The deadliest countries for journalists' lives were Syria, where 15 died, followed by Iran, Eritrea, eastern Ukraine, Iraq and Libya.
The report also said freedom of information decreases substantially during conflict.
"The 2014 World Press Freedom Index spotlights the negative impact of conflicts of freedom of information and its protagonists," Reporters without Borders said.
This year's report covered 180 countries. Finland was the best place for journalists to continue their work- the Scandinavian nation retained its position for the fourth year running, followed by the Netherlands and Norway. Turkmenistan, Eritrea and North Korea were, once again, at the bottom of the list.
National security takes priority
The report said that the ranking of some countries this year was affected by a "tendency to interpret national security needs in an overly broad and abusive manner to the detriment of the right to inform and be informed."
Information was sacrificed in the name of national security and surveillance, the report said, citing the example of the US, which fell 13 place to 46 following "increased efforts to track down whistleblowers and the sources of leaks."
The trial and conviction of Private Bradley Manning, now known as Chelsea Manning, and the pursuit of NSA analyst Edward Snowden "were warnings to all those thinking of assisting in the disclosure of sensitive information that would clearly be in public interest," the report said.