Correct, film was taken; from cameras that had been left in the minibus as the group had been told in advance that photography would not be allowed. The films, when developed, were found to contain pictures from the Athens museum (permitted) and some shots of retired aircraft taken in a civilian scrapyard. The fact that all charges were eventually dropped confirmed that the whole saga was the result of a policeman who was trying to gain some 'brownie points' by getting innocent people arrested. Once this had happened neither he nor the Greek Airforce officer who was behind the arrest were willing to back down.
The group members were well aware of the post-9/11 situation, and indeed had contacted the authorities in Greece during September asking if the trip would need to be cancelled. They were told, in writing, that they would still be welcomed. Some welcome.