Though British officials have foiled far more terrorist plots than they’ve missed, the United Kingdom is on edge after its fifth terrorist attack this year alone.
The September 15 London train bombing that injured 30 was the UK's fifth terror attack this year. A security expert looks at why Europe has been seeing more frequent and bloodier jihadist assaults.
Police gather in West London after the incident.
Terrorists are changing their tactics, so security services must too.
September 2017 in Nangarhar.
Suffering the daily toil of violence, with little chance of escape.
Stretching the limits of civil liberties.
France has been living under a a state of emergency for nearly two years. The president now wants to make some of its most controversial elements permanent law.
Migrants attempting to jump the fence between Morocco and Ceuta, watched by Moroccan police in December 2016.
Tensions are mounting along the EU's only land borders with Africa on the Moroccan coast.
Manhattan on Sept. 11, 2001.
AP Photo/Daniel Hulshizer
An unprecedented onslaught from the US hasn't destroyed the terrorist organization. What is the secret of its resilience?
In this photo from Sept. 11, 2001, firefighters work in the ruins of the World Trade Center towers in New York City after an al-Qaida terrorist attack.
(AP Photo/Mark Lennihan)
It's been 16 years since the terrorist attacks of Sept. 11, 2001. Understanding what propelled al-Qaida's attacks could help guard against further violence.
Police intervene to protect members of National Action as it cancelled a rally in Liverpool in 2015 following counter-protests.
Peter Byrne/PA Archive
Five serving members of the army have been arrested on suspicion of belonging to the group.
When you wash your best sheets for nothing.
EPA/Erik S. Lesser
Far from the millions-strong mass movement of years gone by, today's 'Klan' is really just a smattering of assorted local hate groups.
At a memorial honouring the victims of the recent Spanish terrorist attacks, a family embraces a Barcelona policeman who helped them during the mayhem.
(AP Photo/Santi Palacios, File)
Despite the recent terrorist attacks in Spain, the European Union has dramatically improved its counterterrorism efforts. Here's how.
Cities are responding to the targeting of crowds by terrorists in vehicles.
We live in dangerous times, but how we react to the risk of terrorism will have impacts on our public realm for many years.
A memorial on Las Ramblas following the attack.
A toxic combination of history and social tension makes Spain fertile ground for extremist recruitment.
La Rambla runs right through the centre of Barcelona.
The boulevard runs through the heart of the city, drives its tourist economy and acts as a symbol of life in Catalonia.
Spain plays a relatively inconsequential role in the fight against Islamic State.
The location and targeting of Islamic State's latest attack, on the Spanish city of Barcelona, deviates from the group's previous efforts.
At least 16 people have died, and scores more have been injured, in a terror attack on Barcelona’s Las Ramblas strip.
Barcelona 2017, London 2017, Berlin 2016, Nice 2016. In all of these cases the weapon of choice was a vehicle, driven at speed, into crowds innocently going about their daily business. Barcelona is just…
Did Trump’s rhetoric played a part in radicalizing the far-right protesters in Charlottesville?
AP Photo/Steve Helber
Trump is a master of using anger to motivate his base. An anti-terrorism researcher explains how to stem the tide.
Illicit firearms and small weapons recovered during security operations being destroyed in Nairobi.
German Chancellor Angela Merkel’s comments about weapons as part of development for Africa could have the opposite effect if conditions aren’t strict and democratic processes aren't followed.
Citizen militia march in Charlotttesville, August 12.
EPA/Virginia State Police
Having stoked white resentment for his own benefit throughout his campaign, Trump is still emboldening it.
Leader of Fulani herdsmen Haruna Usman pictured by Reuters in 2014.
Attacks by Fulani herdsmen on communities in West Africa are increasing in number and in sophistication. Regional and national authorities must respond promptly to arrest the threat.
Fortress Europe: Macdeonian soldiers patrol the Greek border.
New research questions the scale of support for tougher border security across Europe.