My friends claimed base got greifed!!

So im writing this report on behalf of my friend (SALMANBHOJANI)..Yesterday a dispute was going on between salmanbhojani and 2 other guyz named as RAMAYKILLER and HARDCOREKILLER..my self and mateen solved the problem between them but when i left the game and logged in today i saw that my friends(slamnbhojani) base was griefed, although it was claimed. Salmanbhojani was there and saw everything he tried to stop them but he failed to do it..He saw that these guyz (RAMAY KILLER, HARDCORE KILLER AND NIRU 03) were placing lava near his claimed base and eventually his base caught fire becuz of wooden house,also they killed Salmanbhojani using lava and took all his stuff including his armour and the tools. Could u pls take a solid  action so that everyone should'nt do it...             cords and pictures are here