Police in the Philippines say a hard-hitting radio commentator has been fatally shot while driving his motorcycle to work, the fourth journalist killed this year in the country.

Police say Romeo Olea died early Monday from two gunshot wounds in Camarines Sur province in the eastern Philippines.

Police Superintendent Ronald Briones says the killing of the 49-year-old commentator for the provincial radio station DWEB-FM was most likely related to his work. Olea's wife told police that her husband had received death threats.

The Philippines is one of most dangerous countries for journalists to work. It ranked third on a list by the Committee to Protect Journalists of places with high numbers of media killings yet very few convictions.