"No talks on alliance between JD(U) and RJD has taken place so far. But, the BJP is gripped with fear hearing possibility of it," Kumar told reporters.
The former Bihar Chief Minister had recently expressed favour for a grand alliance between the JD(U), RJD, Congress and Left against BJP in next year's state Assembly elections.
He had said though no formal talks have begun in this regard, his party holds a 'positive' approach for such a move.
And recently, the three bailed out JD(U) in the bypoll for the two Rajya Sabha seats which had threatened the survival of Manjhi government after BJP-backed Independents propped by JD(U) 18 dissidents.
BJP has been criticising the state government for its closeness with the RJD alleging that it has resulted in the deterioration of law and order situation in the state.