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 the latest in a series of targets of Islamic terrorism over the past year in which a vehicle has been used to mow down those in its path indiscriminately.
In all of these cases Islamic State (IS) has claimed responsibility.
These sorts of terrorist attacks – like the 2001 al-Qaeda plane attacks on targets in New York and Washington – have elevated threats to the civilian population in urban areas to a new level.
In the latest – on Barcelona’s famous tourist precinct near Plaça de Catalunya and Las Ramblas in the heart of the city – at least 16 people have died and scores more have been injured. The death toll is likely to rise.
IS, in a statement on one of its outlets, claimed responsibility for the attack, telling its supporters in Arabic:
Terror is filling the hearts of the Crusader in the land of Andalusia.
Another outlet warned that Spain was now grouped with the UK and France as terrorist targets.
The use of vehicles in relatively vulnerable locations where crowds gather, to inflict maximum harm on innocent people, will add significantly to unease across Europe. This anxiety will now reach new levels of intensity, with German elections due on September 24, and and a Catalan independence vote on October 1.
This latest attack will cast a shadow over events that will require people to gather in crowds either to participate in political campaigning, or to vote in the election itself.
More broadly, the use of vehicles as weapons against urban populations will add to security concerns in Western capitals – including in Australia.
What’s likely to come as a result are further security measures to combat the risk of vehicular attacks in crowded locations. But we know how difficult it is to prevent such attacks.
In Melbourne, Australia, for example, authorities have installed bollards around the city to guard against these sorts of acts. But ensuring people’s safety in free and open societies represents a huge challenge.
World leaders have condemned the Barcelona attack, but beyond pro-forma statements of support the reality is that the scourge of Islamic-inspired terrorism is here to stay for the time being.
These acts of violence, each one encouraging another, are part of a terrorist landscape. They will remain so especially at a moment when IS is under enormous pressure in its stronghold in Syria.
The expulsion of IS from Raqqa in eastern Syria will not lessen threats of terrorist violence in the West. Instead, it will probably heighten the risk.
What the Barcelona attack reminds us is that the West is embroiled in a long war against Islamic terrorism. Enhanced counter-terrorism strategies, making use of sophisticated technology, will lessen risks, but cannot entirely eliminate the threat in open societies.
This is the reality.