Narendra Modi today sharpened his attack on Nitish Kumar, saying the JD(U) leader's "arrogance" and "ambition" to become Prime Minister drove him to split from BJP,and compared the socio-economic conditions of Muslims in Gujarat and Bihar to claim he practised "true" secularism.

The BJP leader chose the recent comments from Kumar that he had more experience than others to be the PM to attack him.

"What was the BJP-JD(U) alliance broken? Some said it was his (Kumar) habit to stab in the back.... We came to know of it four days back. The dream to become PM was not letting him sleep. His arrogance is higher than Mount Everest. He says nobody is as good a PM candidate as him," he told an election rally, his third in Bihar, at the Rangabhumi maidan in Purnea.

Modi quoted from Sachar Committee's report to highlight the better socio-economic conditions of Muslims in Gujarat than Bihar.