The incident took place at the divisional jail last evening when the four undertrials escaped by utilising the commotion during a scuffle between some inmates and the guards, jail superintendent Avinash Kumar Singh said.
Singh, who was also injured in the scuffle, said that raids were being carried out to nab the missing inmates, identified as Sadre Alam, Subodh Kumar, Suraj Kumar and Vinay Baitha.
As many as a dozen prisoners and jail guards sustained injuries in the scuffle and they were given first-aid by the doctors last night, the jail superintendent said.
The injured prisoners, identified as Munna Kunwar and Arun Singh, have been admitted to the Sadar hospital.