I've heard there were 300 to 500 of them there by 3 PM. When we left to meet family, there was maybe 150 of them. I only had one run in when what looked like one of their photographers walked up to us and tried to take my wife's picture. I convinced him that could be hazardous to his health and he scurried away.
High resolution photos of their protest can be found here:
http://tiffanycufflinks.blogspot.com/