A series of bombings claimed by the Islamic State ripped through Brussels airport and a metro train, killing around 35 people in the latest attack to bring carnage to the heart of Europe.
The fact that extremists were able to hit high-profile targets in Brussels, Europe's symbolic capital, just months after Islamic State militants killed 130 people in Paris, raises fresh questions about the continent's ability to cope with terrorism.
It also underscores how Belgium has allowed extremism to develop unchecked, coming just four days after the dramatic arrest in Brussels of key Paris suspect Salah Abdeslam after four months on the run.
Since the infamous Charlie Hebdo attack in France in January 2015, Europe has seen a large number of terror attacks that have claimed the lives of many people.
Here is a timeline of the major terror attacks that took place in Europe since the start of 2015: