Sub-Divisional Officer (SDO) Subhash Chandra raided the jail premises and seized 13 mobile phones, 12 SIM cards, eight chargers from the cells of the inmates, Superintendent of Police Mithu Prasad said.
The raids were carried out in the divisional jail following information about the inmates using banned items in collusion with the jail authorities, he said.
Prasad said that recovery of the banned items clearly pointed to involvement of jail officials in facilitating the use of prohibited items by the inmates.
A report will be sent to the senior officials for strict action against the guilty officials, he said.
The Khagaria divisional jail houses two death row convicts Bodhan Sada and Jahid with other inmates, he said.