Oxford Dictionaries defines terrorism as "the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims."
US dictionary Merriam-Webster describes terrorism as "the systematic use of terror, especially as a means of coercion." There is, however, no commonly accepted definition. The term is often used in connection with unprovoked attacks and killings by an ideologically motivated group, like the so-called "Islamic State" (IS). But it is also sometimes used by governments to denounce opposition groups. This page collates DW content on terrorism.
British "Islamic State" supporter Umar Haque has been found guilty of trying to recruit children to carry out attacks across London. Haque had shown children videos of beheadings and made them re-enact previous attacks.
The far-right terrorism threat "is more significant" than "public debate gives it credit for," the UK's counterterrorism chief has said. In the lead-up to Brexit, the UK has witnessed an increase in far-right extremism.