  Technically there was no evidence that pointed towards Ron or Harry. They both had seal tight alibi's from Neville and Hannah, though she had a feeling the two Hufflepuff's had lied to her. However despite no evidence it was fairly obvious that they would be the culprits. They had already served detentions for doing something similar, though a bit tamer than this, to a Ravenclaw who had bad-mouthed Hagrid.