They were agitated over the alleged murder of 40-year-old advocate Sharavan Kumar Verma. His body was found in a drain close to the place where he stayed in Ganeshganj locality, police said.
The protesting lawyers also pulled down posters and banners from poles and set them on fire, police said, adding fire tenders were requisitioned to put out flames that engulfed the bus.
An emergency meeting of the Oudh Bar Association's executive committee was held to condemn the murder, general secretary of the association R D Shahi said.
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Shahi alleged police used force and lathi charged the agitating lawyers near Swastha Bhawan adjacent to the High Court later in which some lawyers were injured and their vehicles damaged.
"We condemn police action and in protest against the same, will abstain from work tomorrow," Shahi said.