The odd-even scheme was tainted by a big CNG scam, alleged a woman who threw ink at Delhi Chief Minister Arvind Kejriwal on Sunday evening at a public meeting held to celebrate the "success" of Aam Aadmi Party's car-rationing experiment.

The woman, Bhavna Arora, said she has a CD to prove that the AAP has "committed CNG scam". She claimed that she was a member of Aam Aadmi Sena -- Aam Aadmi Party's breakaway group in Punjab, PTI reported.

"Odd-even was positive, but behind that was a big CNG Scam, of which I had a sting. That is why I wanted to meet CM and Gopal Rai ji, but they didn't agree to meet," ANI quoted Arora as saying.

"I will submit all papers and the sting before the court. Investigation should be done in the matter," she said. Arora will appear before the Rohini court on Monday.

The incident took place at around 4:50 pm when Kejriwal was addressing a rally to thank the people of Delhi for the success of odd-even scheme at Chhatrasal Stadium in North Delhi. The 26-year-old woman came close to the dais where Kejriwal was standing and threw ink on him. Although most of the ink was splattered on the lectern, there were stains on Kejriwal's face.

The Delhi Police detained Arora and later arrested her after seeking permission from a duty magistrate. However, she was released on Sunday night on a personal bail bond.

Deputy Chief Minister Manish Sisodia accused the BJP of scripting the attack on Kejriwal and his cabinet ministers. He said the BJP is unhappy with the success of the odd-even scheme.

"There was no security provided by Delhi Police. It is a conspiracy by the BJP and Delhi Police is also involved in it... Who will take the responsibility if any woman or man throws acid at Delhi's chief minister where thousands of people are sitting. What if a bomb goes off," IANS quoted Sisodia as saying.

"They may also kill people because they cannot stand the success of the odd-even scheme and AAP's popularity among the masses," PTI quoted him as saying.

Both the Delhi Police and the BJP have refuted the allegations. Delhi BJP chief Satish Upadhyay said the incident could have been "stage-managed". 

"The incident could well be a case of the activist's frustration or stage-managed by Kejriwal himself to play his usual victim card," Upadhyay said.

The odd-even scheme was implemented on a pilot basis between 1 and 15 January.