The arrest came a day after a news channel aired a sting operation in which the lawyer was seen boasting about beating JNUSU president Kanhaiya Kumar, charged with sedition, when he was brought to the court on February 17.
A senior Delhi Police official said Singh has been arrested in connection with two cases of assault when he presented himself to the investigators at Tilak Marg police station responding to summons.
While Sharma was arrested on Saturday and subsequently released on bail, Chauhan, who led two brazen attacks, is yet to respond to multiple notices issued by the police asking him to join probe.
Groups of lawyers led by Chauhan had thrashed journalists and JNU students and teachers on February 15 and repeated their act on February 17 against Kumar and some journalists, in open defiance of Supreme Court instructions.
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Yashpal Singh was questioned at the police station
Singh has not been granted bail and was booked on the charges of rioting and causing hurt.
"We are still deliberating on the additional charges to be brought against Singh," said the official.
Earlier in the day, Delhi Police Commissioner B S Bassi asserted that coercive action will be taken against the lawyers if they do not respond to the police notices.
"Now we have the option of taking coercive action against them. We will go with the law and arrest them if it demands so," Bassi said.