At least 30 people died on March 22 following a bomb attack at a Brussels airport and an explosion at one of the city's metro station.
Here's Where ISIS Has Claimed Attacks on European Soil
The attacks demonstrate the remarkable adaptability and scale of the ISIS threat that faces Western societies.
Timeline of Recent Terror Attacks in Western Europe
Sweden is the latest to be victimized after France, Germany and England in the past two years.
Belgium: Man Arrested, Suspected of Vehicle Attack Plot
The man named as French national Mohamed R, was driving at high speed down Antwerp's main shopping street with weapons in his car.
Brussels Commemorates Airport and Subway Attacks
Thirty-two people were killed and 300 injured in the attacks, which ISIS claimed responsibility for.
Belgian Counterterror Policies 'Abusive': Report
Human Rights Watch interviewed 23 people alleging physical or verbal abuse.
Belgium Hunts 'Most Wanted' Suspect in Brussels Attacks
The cousin of the el-Bakraoui brothers spent years in Iraqi imprisonment before returning to Europe.
Belgium Charges Man in Plot to Commit Terror Attack
Suspect's brother was initially arrested but is released after going before a judge.
Nice: France Shows the Cracks as Violence Reigns
Certain conditions in France mean the disaffected have become radicalized with knock-on effects.
France 'Needs Security Overhaul' After Paris Attacks
A parliamentary commission has recommended setting up a national counter-terrorism hub.
Brussels Anti-Terrorism Operation Begins, Man Arrested
Witnesses saw the individual acting suspiciously near the City2 shopping center.
Belgium Makes New Arrest in Brussels Attacks Probe
Belgian police raid Brussels apartment and arrest man on charges related to extremism.
France Launches Euro 2016 App to Warn Fans of Attacks
The release comes as fears about extremist attacks rise ahead of the start of the tournament.
Belgium: Four Terror Suspects Arrrested
Some of the group are believed to be linked to Islamic State.
Brussels Suicide Bomber's Brother Makes Olympics
Mourad Laachraoui, brother of Najim Laachraoui, who blew himself up at Brussels Airport, wins gold at European Taekwondo Championships.
Paris Attacks Suspect Refuses to Speak in Court
The Paris attacks suspect refused to respond to questions from the judge in his first court appearance.
Pope Francis Praises London's New Muslim Mayor
Francis says that Sadiq Khan's election is an example of integration and that migrants must not be "ghettoized."
Trial of Belgian Militant Cell Begins in Brussels
Only seven of the accused will appear in court as nine are on the run.
Outcry Over Danish Showcase of Brussels, Paris Bombers
Copenhagen police have been called over exhibition that plans to show the other side of "martyrs."
Why France's State Of Emergency Is Not Working
Draconian laws don't tackle the social problems that got the country into this mess.
Five Arrested by British Counterterrorism Officials
Four people were arrested in Birmingham and one person at London's Gatwick airport.
Brussels Attacks: Belgium's Transport Minister Resigns
The EU had reportedly warned Belgium over airport security before the attacks.
Belgium's 'Biggest Jihadi Recruiter' Receives 15 Years
Khaled Zerkani has links to suspects in the Paris and Brussels attacks.
Obama: Islamic State Recruits Head To Libya
The number of ISIS fighters in Libya has doubled in the past year to between 4,000 and 6,000.
Laptop of Brussels Bomber Reveals New Information
Bakraoui referred to striking Britain, the La Défense business district in Paris, and Civitas.
Belgian Police Charge Two Men Over Brussels Attacks
A further three people were arrested in connection with the November 2015 attacks in Paris.
Brussels Bombers Planned 2nd France Attack: Prosecutors
Militant cell changed its target to Brussels as police investigation into Paris attacks unfolded.
Brussels Terror Suspect Admits He's 'Man in a Hat'
All of the main suspects in the Brussels and Paris attacks appear to have been taken off Europe's streets.
Ex-Prisoner 6th Arrested in Brussels Bombing Probe
Bilal El Makhoukhi was released from custody just last month after 2015 conviction.
Brazilian Forces Launch Anti-Terrorism Exercises
Commandos in full gear rappelled down helicopters with dogs and weapons.
Video Shows Brussels Attacks Fugitive's Airport Escape
The unidentified third suitcase bomber, who failed to detonate his device, is seen running from the airport.