Journalists in Mexico are marking World Press Freedom Day by mourning the deaths of three colleagues killed in Veracruz.

Their deaths highlight the risk many reporters take on a daily basis to do their job. Reporters Without Borders says worldwide, 67 journalists were killed in 2011.

The latest killings in Mexico came less than a week after the murder of an investigative reporter in Veracruz, from where Al Jazeera's Franc Contreras reports.