West Bengal Chief Minister Mamata Banerjee retaliated with allegations regarding the Rafale deal following Prime Minister Narendra Modi's chit fund barb at her on Friday.

Dubbing the prime minister the "master of corruption", Mamata said he is scared of the united Opposition and is hence making such incoherent statements.

"Now from chaiwala, he has become Rafale-wala," Mamata said.

She also said 23-24 political parties are now working together against the BJP, and in the upcoming Lok Sabha elections, Modi will face such a crushing defeat that he will never be able to make a come back into electoral politics.

"He is scared because India in united now. In this election Modi will face such a defeat that he will never be able to recover. Even if her returns to Gujarat, where he was the chief minister, he will not be able to win," Mamata said.

Indicating that she is not averse to the prospect of the Opposition parties coming together against Modi over the Rafale deal.

"Rafale deal is one of the biggest scams in India. I am not aware of the details, neither do I know how much money has changed hands. But there must be something about it. I support Congress' view over the issue," Mamata said.

"He (Modi) is the most corrupt person in the country. He is the Rafale master. He is a master of corruption and arrogance, a shame for the country," she said.

She also said she "never expected a prime minister of such low standards.

Slamming the prime minister for destroying institutions such as the CBI and the RBI, she denied the prime minister's allegations regarding the circuit bench in the Calcutta High Court in Jalpaiguri.

Earlier in the day, the chief minister had announced that West Bengal has got investment proposals worth more than Rs.2.84 lakh crore.