This is also well known as the previous topics, most people know this as the attack on WTC and Pentagon. More people know this as Al Qaeda.
But this is much more bigger then both those two cases together.
Since the regime de la terreur (Reign of Terror, France 1793-1794) these cases have occured more often, and more devestating each time. Even though it is rare someone dies from terrorism acts, it is still unbelievable that through the last years the number of deaths have increased.
These pictures are a few scenarios, all made by acts of terrorism/war ("Terrorism is the war of the poor, and, war is the terrorism of the rich", Peter Ustinov, Unsourced)