Brussels: 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: Islamic State-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 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 the Islamic State group in Syria.
May 22, 2013: Two al-Qaida-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-Qaida 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 Qaida-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....