Hi there,
first of all: I was not at the scene while the raid happened.
Thus all information concerning this case I report based on infos I got from the most frequently used German tournament paintball portal
www.pbhub.de
Apparently 60 (!) riot policemen entered the hall while a 5-man tournament was held. They entered the field in the middle of a running game and verbally forced all players to lay their markers down. Every marker in the hall got confiscated. There was no direct physical force involved and all policemen were somewhat friendly - they carried out their orders.
Apparently planning the intervention was made already three weeks ago and at least one player got a glimpse on a file one policeman carried around including a printout of a screen shot of their team's web page. Obviously extensive research was done, although the policemen at the scene didn't really have the insight on the sport (running on the field without eye-protection whilst a game was going on, asking refs for their markers, asking not for team captains but in Germany somewhat derogative military teams for group leaders, etc).
According to an official police report 58 guns were taken into custody. Criminal investigation proceedings are currently running against 54 players.
Everything else is rumours or assumptions. Although someone who obviously didn't like what was going on on that field tipping off the police is highly probable. The current atmosphere is complete bafflement, frightening, outrage at the same time.
A video is in the making and yet has to be postproduced but will be available on youtube soon covering the entire thing.
sources:
www.pbhub.,de and
http://www.berlin.de/polizei/presse-fahndung/archiv/146174/index.html