Emma shares the story of Syed Farook and Tashfeen Malik, who opened fire on a company Christmas Party in 2015 in Southern California. 

https://abcnews.go.com/US/christmas-party-triggered-san-bernardino-terror-attack-police/story?id=43884973

https://www.bbc.com/news/world-us-canada-54669918

https://en.wikipedia.org/wiki/2015_San_Bernardino_attack

https://www.bbc.com/news/world-us-canada-34993344