Timeline: The Irish links with Jihadists since the late 90s
After it emerged that one of the men who carried out the terror attack in London lived unnoticed in Dublin, there are fears Ireland is being used as a gateway to the UK for extremists.
Rachid Redouane lived in Rathmines with his wife and child just months before he carried out Saturday's attack with two other jihadis, killing seven and injuring dozens of others.
Redouane is not the first terrorist to live here and on Tuesday former Justice Minister Dermot Ahern said we need more investment in An Garda Siochana to ensure we can effectively monitor potential terror suspects and respond in an emergency.
Here is Ireland's history with Muslim extremists:
Late 1990s: Gardaí and the Defence Forces begin monitoring suspected Islamic terror sympathisers.
2000: A Jordanian man, who would later be described as the foremost Irish-based facilitator of Isil fighters, arrives in Ireland.
The same year an Algerian national gets refugee status in Ireland after concealing his identity as an Islamist extremist sympathiser. He uses his new status to travel to the continent and fundraise for jihadists.
October 2003: Khalid Kelly, a Dublin-born Muslim convert previously born Terrence Kelly, appears on the 'Late Late Show' with British extremist Anjem Choudary defending the 9/11 terror attacks.
2004: Naturalised Irish citizen Ibrahim Buisir is put on a US government list of suspected terrorists for alleged fundraising activities. Libyan-born Buisir is never charged with any terrorist offence and denied the US claims.
September 2005: Government officials tell the US Embassy up to 30 al-Qa'ida sympathisers are under surveillance.
November 2005: The Algerian is convicted in Paris of terror offences in Ireland, England, France, Spain and Andorra. His trial hears he is an al Qa'ida sympathiser, which he denies.
October 2009: American Muslim convert Coleen LaRose, dubbed 'Jihad Jane' is arrested in the US for conspiring to murder a Swedish cartoonist who depicted the prophet Muhammad as a dog. The plot was hatched while she was living in Waterford. She is subsequently jailed for four years.
May 2011: Khalid Kelly is arrested for threatening to kill US President Barack Obama on his visit to Ireland.
November 2012: Moroccan Rachid Redouane marries a Scottish woman in a Dublin registry office, guaranteeing him EU residency. He lives in Rathmines and works as a chef.
February 2016: Spain clears extradition to the US of Algerian-born Ali Charafe Damache, an alleged co-conspirator of Coleen LaRose. He previously successfully fought against extradition from Ireland.
July 2016: The Jordanian is deported after a lengthy legal battle during which he was supported in court by Khalid Kelly.
November 2016: Khalid Kelly blows himself up in a failed suicide bombing mission for Isil in Iraq.
June 2017: Rachid Redouane and two other men launch an attack on London, using a van and knives to murder seven and injure dozens more. The three attackers are killed by police.