The Brussels bombings were the worst terrorist attack in Western Europe since the attacks in Paris last November.

Because of this, the continent has been on high alert ever since. But it’s not the only area of the world to be struck by terrorism.

There is no internationally accepted definition of the word – no minimum number of causalities needed; no particular method of violence; no specific time or place.

Instead, most agencies tend to make the classification based on intent or motive. According to the FBI, international terrorism includes violence that is intended to ‘intimidate or coerce’ a civilian population or government.

The UN states that terrorist attacks violate human rights and the rule of law.

Regardless of how the act is defined, numerous terrorist attacks have taken place between the bombings in Paris on November 13, 2015 and the events in Brussels earlier this week.