Camping Laws

[Novoselic]

So I was soloing right by docks at Oasis for atleast 2 hours with no problems. Then out of nowhere a full group just walks right up and starts killing all the mobs, including ones I had already tagged. I told them to leave and they said that this wasn't a camp and that they could do whatever they wanted, so I just kept leveling anyway. But I just wanted to know, even if I am soloing at that spot was I in the right or can they just swoop in and claim the spot? If something like this happens can I report the group?