Canadian authorities are investigating a suspected improvised explosive device that was detonated at a courthouse.
A Polish prosecutor says 11 people have been charged after a bizarre protest at the former Nazi death camp Auschwitz.
What distinguishes an attack from an act of "terrorism?" The line is often blurry.
UK Prime Minister Theresa May will begin the formal process of ending Britain's 44-year membership of the European Union.
The wife of Khalid Masood, who killed four people and injured dozens in London last week, has spoken out.