The CBI said it has filed a charge-sheet against Lalu Prasad and others in connection with its probe into alleged irregularities in the 2006 IRCTC hotels case.
Sources said the team questioned Rabri Devi and her son, a former deputy chief minister, for close to four hours.
RJD leader Tejashwi Yadav called for a Grand Alliance at the national level to defeat the BJP and said there was a need for opposition leaders to shed their ego.
The RJD alleged that there was "nothing" for Bihar in the union budget and squarely blamed Nitish Kumar for the alleged "step motherly treatment" meted out by the Centre.
Tejashwi Yadav attacked the Bharatiya Janata Party (BJP) and its ally Chief Minister Nitish Kumar, saying they have become synonymous with deceit and betrayal.
RJD leaders Tejashwi Yadav, Tej Pratap Yadav and Misa Bharti attacked the Bihar govt over rising crime and wondered why television channels were silent over the issue.
RJD declared Lalu Prasad's son and former Bihar Deputy CM Tejashwi Yadav as its chief ministerial candidate for the next Assembly election in the state.
The ED said that it has summoned Rabri Devi and Tejashwi Yadav in connection with a money laundering probe into the 2006 IRCTC hotel maintenance contract case.
RJD chief Lalu Prasad lashed out at Bihar Chief Minister Nitish Kumar for calling his son and Leader of Opposition Tejashwi Yadav a "child".
Lalu Prasad said his son Tejashwi Yadav will lead the party in the next Bihar Assembly polls.