Dublin Fianna Fail MEP, Mr Niall Andrews, told a group of provincial press and radio representatives in Brussels yesterday that the murder of Veronica Guerin had placed a threat on the life of every journalist.
Mr Andrews, one of a group of six MEPs who addressed a briefing of the journalists, called for the introduction of legislation which would lead to a mandatory jail term of 10 to 12 years for anyone caught in possession of an illegally held gun.
"People who carry a weapon have it with intent to murder - the whole country is in deep shock over the killing of the journalist."
He believed the murder was linked to the drugs trade and said the victim had tried to expose criminals who were involved in international racketeering, including money laundering.
Connacht Ulster MEP, Mr Pat the Cope Gallagher, said the entire country was repulsed by the killing and he called for the support of everyone in helping gardai to track down the murderer.
Dublin Green MEP, Ms Patricia McKenna, feared the killing would hit investigative journalism in Ireland.
Dublin Labour MEP, Ms Bernie Malone, described the killing as a "dastardly deed" and Munster MEP, Mr Pat Cox, in a tribute to Ms Guerin, said she was a "very brave journalist".
Mr Joe McCartin, MEP, also tendered sympathy to the victim's family.