article: But the focus on the manhunt - and the shock and grief inspired by the attack - cannot hide the fact that there are also major questions about the atrocities and the response which lie unanswered. One set of questions relate to whether France could have detected such a large plot. After attacks in the UK, there are often questions about "intelligence failures". The 7/7 attacks in 2005 sparked multiple investigations after it emerged that some of those responsible had been "on the radar" of the security services and police. Similar questions were asked after the killing of Lee Rigby in May 2013. The cell behind the Paris attacks appears to have been built around individuals who had gone from France and Belgium out to Syria, received training and then been sent back. Former French intelligence officials acknowledge in this case that there was a failure. Men who were known to the authorities managed to travel and plan and then carry out a deadly attack. Who were the attackers? What is 'Islamic State'? But the reasons for this partly lie in the scale of the challenge France faces. The authorities say they are dealing with 11,000 extremists on their radar. Working out who to follow amidst so many is a challenge for any security service. The problems with travel into and inside Europe's Schengen area pose an additional challenge, along with that of weak information-sharing amongst countries. In the past, attacks were inspired by the so-called Islamic State (IS) but this one was different - it was directed and organised by the group. From the start it was clear that it was highly organised and sophisticated - not the work of so-called "lone actors", but a group working together. Abaaoud may have been the ringleader but it is not clear yet if there was further supervision and direction from the top of IS. Learning that could help the process of discovering whether there are other cells who have been sent to undertake similar operations in France or other countries. France does have experienced security services because it has been dealing with the threat of jihadism longer than most. The legacy of the conflict in Algeria always made it a target. In the mid-1990s, a series of attacks rocked Paris with bombs on the subway. These were linked to Algerian groups whose reach often extended to the UK. With figures like Abu Qatada and Abu Hamza radicalising and preaching, the French christened the British capital "Londonistan" and chided it for offering a safe haven so long as no violence was directed its way. France sent its spies undercover to try to penetrate the groups in Britain and pushed for more action. British officials only understood the danger after 9/11 though and belatedly began acting. Meanwhile France managed to successfully avoid major attacks in those years at the same time as London and Madrid were hit. Special report: In-depth coverage of the attacks and their aftermath The French Security Service enjoyed a robust reputation for running extensive networks of informers across mosques and the
summary: There was applause for the French security services and police in the National Assembly on Thursday when it was announced that they had caught - and killed - the planner of the Paris attacks, Abdelhamid Abaaoud.