Paswan alleged that incidents of rape in Nitish Kumar-ruled Bihar were "distressing" and "alarming".
"In the context of the recent barbaric gang rape case of Delhi girl, I would like to draw your kind attention to the distressing situation of rape cases in the state of Bihar. It may be seen from the data taken from the website of Bihar Police.
"The above indicates that the position of rape cases in Bihar is quite alarming and Government of Bihar does not seem to be serious at all to deal with persons accused in these heinous crimes against women," he said in a letter to the Prime Minister.
Enclosing a copy of the Bihar Police website in his letter to the Prime Minister, he said that a total of 823 rape cases have been registered in various police stations in the state from Bihar from January to October 2012.
"This goes to show that on an average three rape cases are taking place in Bihar everyday. In the last 15 days, seven cases of heinous nature have been reported from the state.
"It is not understood as to why the Nitish Kumar government does not come forward to release this data and action taken thereon before passing any value judgement on such sensitive incidents taking place in other places including Delhi," the Rajya Sabha MP said in the letter.
The LJP chief urged the Prime Minister to take up this matter with the Government of Bihar and "direct them to address these issues on priority and with all seriousness".
In a press release, LJP Secretary General Abdul Khaliq said that Paswan expressed "anguish" over "increasing" number of sexual offences in Bihar and has urged the Prime Minister to intervene and pass directives to the state government to take prompt action against sexual offenders.