While one of the three lawyers has been identified as Vikram Singh Chauhan, names of the other two have not been disclosed by the police.
All three of them were sent summons yesterday and asked to appear before the police at 3 PM.
Delhi Police Commissioner B S Bassi said the police will move court and obtain warrants if the three lawyers failed to do so.
BJP MLA O P Sharma, who was caught on camera beating a CPI activist at Patiala House court on Monday, joined the probe today, a day after he was served a similar summon.
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Chauhan, who was caught on camera assaulting journalists, students and teachers of JNU at Patiala House court complex on Monday, once again led a brazen attack on journalists and JNUSU president Kanhaiya Kumar at the court premises yesterday.
Later, a person who identified himself as one Surendra Tyagi came outside the court yesterday and claimed that he was among the attackers too. Boasting about his action, he confronted the media saying, "We have done our job for today."