With Barcelona joining the list of European cities targeted by extremist groups, we take a look at major attacks in the continent, since Madrid in 2004.

Timeline

March 2004 - Madrid, Spain

191 people were killed and over 600 were injured when a train line in Madrid was targeted. The Abu Hafs al-Masri Brigade, as part of the al-Qaeda took responsibility for the attack.

October 2004 - Paris, France

Bomb attack against the Indonesian Embassy in Paris by Algerian militants.

July 2005 - London, United Kingdom

Suicide bombers attacked a bus and three underground trains in London, killing 52 people. al-Qaeda took responsibility.

July 2011 - Oslo, Norway

The lone-wolf attack by Anders Breivik claimed a total of 77 lives and left over 300 injured.

July 2012 - Burgas, Bulgaria

A suicide bomber attack, the attack was aimed at Israeli tourists on a bus in Bulgaria. Five tourists and the bus driver were killed.

May 2014 - Brussels, Belgium

A lone gunman, claiming allegiance to the Islamic State, opened fire in the Jewish museum at Brussels, killing four persons.

January 2015 - Paris, France

Two terrorists with assault rifles attacked the office of Charlie Hebdo, a French satirical magazine, and killed many of the staffers.

November 2015 - Paris, France

Islamic State terrorists used suicide bombers and also opened fire at a football stadium, a concert and a cafe, killing over a 100.

March 2016 - Brussels, Belgium

Two explosions at the Brussels Airport killed 34, while another explosion took place at the Maelbeek metro station. The Islamic State took responsibility of the attacks.

July 2016 - Nice, France

A cargo truck was deliberately driven into a crowd celebrating Bastille Day in the holiday city of Nice, killing 86 people and injuring over 400 others.

July 2016 - Munich, Germany

Gunman opened fire at a shopping mall in Munich, killing nine persons.

December 2016 - Berlin, Germany

A truck ploughed into the crowd at a Christmas market in Berlin killing 12 and injuring over 50 persons.

December 2016 - Zurich, Switzerland

A man opened fire at an Islamic centre in Zurich injuring three people.

March 2017 - London, United Kingdom

Five people, including a police officer, were killed in a suspected terror attack outside the British Parliament by an attacker who was shot dead by police.

April 2017 - Paris, France

A police officer and a shooter were killed on Paris's iconic Avenue des Champs Elysees at on April 20, 2017. The Islamic State group claimed responsibility for the attack, which hit just three days before a tense presidential election.

May 2017 - Manchester, United Kingdom

Twenty-two people were killed and around 60 injured in what police believe is a suicide attack by a person at a concert arena in the northern English city of Manchester overnight.

June 2017 - London, United Kingdom

At least six were killed in two incidents. A van mowed down people at London bridge before the assailants stabbed a number of people at Borough Market on a Saturday night.

August 2017 - Barcelona, Spain

A white van jumped the sidewalk in Barcelona’s historic Las Ramblas district, injuring several people as it plowed into a summer crowd of tourists and residents.

September 2017 - London, United Kingdom

September 16’s blast in a London Tube injured at least 22 people. ISIS took responsibility for the attack. The incident is the fifth terror attack this year in Britain.

May 2018 - Liege, Belgium

A man killed two policewomen and a bystander in the Belgian city of Liege before being shot dead in a gun battle at a school in what prosecutors are treating as a terrorist attack.

Click on the locations for details.