Deadly attacks Tuesday at the Brussels airport and a metro station in the city are the latest in a string of attacks in Europe in recent years. Here are some of the most recent major ones:
-- Nov. 13, 2015: ISIS-linked extremists attacked the Bataclan concert hall and other sites across Paris, killing 130 people. A key suspect in the attack, 26-year-old Salah Abdeslam, was arrested in Brussels on March 18, 2016.
-- Jan. 7, 2015: A gun assault on the Paris offices of the satirical magazine Charlie Hebdo kills 12 people. Al Qaeda in the Arabian Peninsula claimed responsibility for the attack, saying it was in revenge for Charlie Hebdo's depictions of the Muslim prophet Mohammed.
-- May 24, 2014: Four people are killed at the Jewish Museum in Brussels by an intruder with a Kalashnikov. The accused is a former French fighter linked to ISIS in Syria.
-- May 22, 2013: Two Al Qaeda-inspired extremists run down British soldier Lee Rigby in a London street, then stab and hack him to death.
-- March 2012: A gunman claiming links to Al Qaeda kills three Jewish schoolchildren, a rabbi and three paratroopers in Toulouse, southern France.
-- July 22, 2011: Anti-Muslim extremist Anders Behring Breivik plants a bomb in Oslo then launches a shooting massacre on a youth camp on Norway's Utoya island, killing 77 people, many of them teenagers.
-- Nov. 2, 2011: The offices of Charlie Hebdo in Paris are firebombed after the satirical magazine runs a cover featuring a caricature of the Prophet Muhammad. No one is injured.
-- July 7, 2005: 52 commuters are killed in London when four Al Qaeda-inspired suicide bombers blow themselves up on three subway trains and a bus.
-- March 11, 2004: Bombs on rush-hour trains kill 191 people at Madrid's Atocha station in Europe's worst Islamic extremist attack.