Pro-Palestinian protesters shut down entrance to World Trade Center in NYC

Pro-Palestinian protesters on Thursday shut down an entrance to the World Trade Center in New York City. 

Hundreds marched to the site after gathering several blocks away in Zuccotti Park for the "Flood NYC for Palestine" demonstration.

Video footage taken at the building shows a police officer standing in front of glass doors to prevent the crowd from going inside. 

The protesters waved Palestinian flags and chanted various slogans, including “Free, Free Palestine!” 

The building stands where the 9/11 attacks occurred in 2001