Army surplus, Patrol store, specialist equipment suppliers & as Walkin221 says a possible riot control exercise. Just because a picture shows one thing it doesn't necessarily mean it's true. I have several pairs of Boots & DPM clothing which is the same as used by todays Military though I've been out of the Army since 1993.
I know Germans who wear American combat gear to go fishing & no way have they any connection to a Military of any sort, some people look for conspiracies all over the place when in reality there aren't any (I do believe I've mentioned this before).
And believe it or not there are those out there whose aim in life is to start trouble & riots for their own ends & have no links with that Countries law enforcement or Military agencies.
http://news.bbc.co.uk/2/hi/8094396.stm