Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Bank customers have slammed HSBC after six of its workers made a mock ISIS execution video during a team-building day at a go karting centre. The footage, posted online, shows five men in black overalls and balaclavas laughing as they stand over an Asian colleague, named as Saf Ahmed, who is kneeling in an orange jumpsuit. One of the workers shouts 'Allahu Akbar' - Arabic for 'God is great' - as an 'executioner' brandishes a coat hanger as a fake knife. The bank revealed it has sacked six of its staff today as their stunt was branded 'utter, utter idiocy' online.Bank staff wore black overalls and balaclavas during eight-second videoColleague kneels in orange jumpsuit as one worker shouts 'Allahu Akbar'Another brandishes a coat hanger as a fake knife during mock executionSix men - thought to be legal staff - were sacked after video emergedDo you know the men involved? Phone 0203 615 2676 or email richard.spillett@mailonline.co.ukBirmingham MP Shabana Mahmood said mock video was 'unacceptable' 
 Question:_ has used its carefully-produced propaganda videos to recruit extremists from around the world to its cause.

ISIS