Unidentified miscreants late on Wednesday night shot at and critically injured a manager of a stone crusher unit at Silipandi under Nandapur block of the district. The victim was identified as Prasad Rao.
Sources said the unidentified miscreants entered the stone crusher unit located at Silipandi and suddenly fired some rounds at Rao and fled from the spot.
On being informed about the matter, police rushed to the spot and sent Rao to a local hospital.
Later, he was shifted to Visakhapatnam hospital as his health condition deteriorated.
While the exact motive behind firing is yet to be ascertained, police have detained one person in connection with the case and interrogating him to unearth more information.