Forest range officer Khurshid Alam had detained one Salman yesterday for illegal felling of trees in Motipur range of Katarniaghat wildlife division, they said.
Upon getting the news, a mob attacked the range office and forcibly took away Salman from the lockup, the officers said.
The mob also vandalized the range office and manhandled the staff. Half a dozen employees, including ranger Khurshid Alam and deputy ranger Ram Pyare were injured in the incident, they said.