Delhi deputy chief minister Manish Sisodia on Wednesday alleged that the BJP leadership had knowledge of the attack on Arvind Kejriwal and the party wants the chief minister 'eliminated' to stop him from working for the people.

On Tuesday, a man flung chilli powder at Kejriwal outside his office in the Delhi secretariat. The chief minister's glasses broke but he was not injured.

The attacker, identified as Anil Kumar Sharma, has been arrested.

'Home minister Rajnath Singh called Kejriwal and asked him to file a complaint in the attack on him. Is this the way an attack on a chief minister should be probed?' Sisodia asked at a press conference.

Sharma's Facebook profile shows that he is a member of the BJP, he said.

'After failing to stop Kejriwal from working for the people of Delhi, now the BJP wants him eliminated. The entire series of events indicate that top BJP leadership had knowledge of the attack on Kejriwal,' Sisodia claimed.

The deputy chief minister also lashed out at Delhi police, alleging it was acting on the behest of the BJP and trying to save the culprit.

'Even 24 hours after the attack, Delhi's Lt Governor has not reacted... This means that he also knew about it,' Sisodia alleged.

Delhi's ruling Aam Aadmi Party has said it will hold a protest against the attack at the BJP's national headquarters on Wednesday.

Later on Tuesday, Delhi police registered a case against Sharma at the IP Estate police station.

However, no formal complaint was received from the secretariat, a senior police official said.