(S (S (PP (IN On) (BASENP (JJ further) (NN investigation))) (COMMA ,) (S (BASENP (PRP it)) (VP (VBD was) (VP (VBN discovered) (SBAR (IN that) (S (BASENP (DT an) (NN individual) (CC or) (NN group)) (VP (VBZ claims) (NP (BASENP (NN responsibility)) (PP (IN for) (S (VP (VBG attacking) (NP (BASENP (DT the) (NN website)) (PP (IN on) (BASENP (DT an) (JJ Iranian) (NN internet) (NN forum))))))))))))))) (PERIOD .))