"Chief Minister Nitish Kumar should order a high level probe into the 'soil purchase scam' in which Environment and Forest minister Tej Pratap Yadav is involved. CM should sack Yadav from his cabinet without making any delay," Modi told reporters on the sidelines of 'Janata Darbar' at his official residence.
He charged the RJD supremo Lalu Prasad's minister son Tej with giving contract of Rs 90 lakh for land filling work in Sanjay Gandhi Biological Park located in the state capital.
"The entire episode smacks of misappropriation of public money ... Politicians too have started reaping benefits by forming 'shell' companies in Bihar also," he claimed.
The accusation drew sharp reaction from the minister and Prasad.
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"I will file defamation case against Sushil Modi. He has hatched conspiracy to tarnish my and family image," Yadav said in a tweet.
Yadav, the elder son of Prasad, further wrote on the micro blogging site said his department was competent to answer the "concocted accusations."
Prasad rallied behind his son as he rejected the charges and expressed readiness for any probe in this regard.
"The allegation is far from truth. Get it inquired by anybody," he told mediapersons.
"If my family is deriving any money from any such thing in the Patna Botanical garden it must have been recorded somewhere by authority there...Get is checked to ascertain the facts," he said.
The RJD chief said his family has been rather providing cowdung to the Patna zoo free for past one-and-a-half years for its use.