 Complete the following phrase:  On December 11, 2010, the Swedish capital of Stockholm was attacked by a suicide bomber, killing himself and injuring two others. Minister for Foreign Affairs Carl Bildt described the event as the Most worrying attempt at terrorist attack in crowded part of central Stockholm. Failed  but could have been truly catastrophic. Although Swedish citizens of foreign background have committed suicide attacks abroad, this was the first time such an incident took place on Swedish ground. The incident is known as the 