I must say, it was very scary. If a Police officer can stop 1 photographer because they're seen as a threat, imagine how I scared I felt that the 150 photographers who turned out, could all have been terrorists!
It was a peaceful protest, many media outlets being represented and more DSLR's (and some film cameras :) snapping away than you've ever heard or seen before!
A few images below, more can be seen here: