Reference the Manhattan Truck Attack -

According to federal court papers, he said:
The attack was a year in the planning and he carried out a trial run with a rental truck last month
He intentionally chose Halloween because he believed there would be more people in the streets
He originally planned to target the Brooklyn Bridge as well
He wanted to display Islamic State (IS) flags on the truck, but decided not to draw attention to himself
He was inspired by 90 graphic and violent propaganda videos found on his phone - in particular, one in which IS leader Abu Bakr al-Baghdadi asks what Muslims are doing to avenge deaths in Iraq.
http://www.bbc.com/news/world-us-canada-41835266