The woman, who appeared to be in her 20s, came close to the lectern when Kejriwal was delivering his speech, waved some papers towards him, and then threw ink at the Chief Minister. Some ink also fell on the Chief Minister and those standing close to him.
The woman, who claimed to be a member of the Punjab unit of Aam Aadmi Sena, a splinter group of Delhi's ruling AAP, was later whisked away by police and questioned at the Model Town police station.
"I can see a BJP conspiracy. They want to take advantage of such a situation and attack Kejriwal and the entire Cabinet. They may also kill people because they cannot stand the success of the odd-even scheme and AAP's popularity among the masses. Police is a part of the conspiracy," he told reporters.
The incident happened around 4.50 PM when Kejriwal was five minutes into his address at the rally organised by the city government to thank people of Delhi for making the pilot road-rationing scheme a "grand success".
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He later said, "Leave her. She is referring to some scam...CNG scam. Take the papers from her.
"Whenever something good is attempted in the country or in Delhi some forces create all sorts of hurdles. As Gopal Rai said, many forces had tried to ensure the odd-even scheme failed," he said.
When asked about the incident, police said the woman was being interrogated but refused to divulge her name.
The woman, on her part, claimed that she has "proof in the form of a CD" that "these people have committed CNG scam".
"shameful", while Water Resource Minister Kapil Mishra said that people of Delhi will "punish" BJP. Both were seated on the dais at the time of the incident.
Sisodia said the issue was not about Kejriwal's security alone as the consequences, had it been a bomb or acid attack, would have been ghastly.
"Where is their (police) high alert? Delhi Police seems not to care for an event where thousands had gathered. There was no checking and police was not concerned about public security," Sisodia said.
He wondered how the woman was talking to reporters even after committing the act. "That means police is a part of the conspiracy and is with BJP."
"Centre should own responsibility and take action because such incidents have happened in the past as well. People who are staging these incidents, hathcing conspiracies from behind the scene, should be acted against," he added.
AAP Delhi Chief Dilip Pandey tweeted, "I'm waiting for incompetent Delhi Police chief to start a series of interviews, as always, explaining why he is least bothered of what happend.