Paris - A shooting rampage by an Islamic State supporter in Vienna that killed four people is the latest in a spate of such atrocities in Europe.
Here is a recap of the deadliest attacks since 2015:
- Austria -
On Monday evening, hours before Austria re-imposed a lockdown, passers by were shot in six locations across central Vienna including near a synagogue and its world famous opera house.
The suspected killer was later shot dead by police. The Austrian interior ministry said he was a convicted IS supporter, an ethnic Albanian with dual Macedonian-Austrian nationality.
- France -
France has been a particular target of jihadist attacks, most recently with the beheading of French school teacher Samuel Paty and an attack on a church in Nice that left three dead.
The teacher was killed on October 16 by a Chechen extremist in a Paris suburb after he showed pupils cartoons of the Prophet Mohammed during a lesson on freedom of expression.
Then last week three people were killed inside a church in Nice by a young Tunisian migrant, who slit the throats of two victims.
The wave of French bloodshed reached a new level in January 2015, when two brothers vowing allegiance to Al-Qaeda shot dead 12 people at the satirical magazine, Charlie Hebdo, in Paris.
Then in November the country suffered its deadliest jihadist attack when 130 people died in bombings and shootings across the capital including at the Bataclan concert hall.
The following year, a man rammed a truck into a crowd in Nice on the July 14 national holiday, killing 86 people.
In 2018, a man who swore allegiance to the IS killed five people at a Christmas market in the eastern city of Strasbourg.
- Britain -
Britain was hit by a spate of attacks in 2017, all claimed by the IS group.
Five people died in March when a man rammed a car into pedestrians on London's Westminster Bridge and then fatally stabbed a police officer outside parliament.
In May a bombing at a pop concert by US star Ariana Grande in Manchester killed 22 people, including children.
A month later a van rammed into a crowd on London Bridge and three assailants armed with knives randomly attacked passers-by. Eight people were killed.
- Spain -
In 2017 a Moroccan man mowed down pedestrians with a van on Barcelona's famous Las Ramblas street, killing 14 people. He then killed a man from whom he stole a car.
Hours later five accomplices rammed a car into pedestrians in the seaside town of Cambrils, south of Barcelona.
The IS group said its "soldiers" had committed the attack.
- Belgium -
In 2016 suicide bombings claimed by the Islamic State killed 32 people at Brussels airport and the Maelbeek metro station, near the European Union headquarters.
- Germany -
In 2016 a Tunisian man hijacked a truck and ploughed into shoppers at a Christmas market in Berlin, killing 12 people.
His rampage was claimed by the IS group.