Mr Waheed Popoola, the Ondo State Commandant, Nigerian Security and Civil Defence Corps (NSCDC), said it arrested seven suspects operating illegal refinery and petroleum depot.
Popoola said this when he briefed newsmen on the activities of the state command of the NSCDC in Akure on Thursday.
He said the suspects were picked up at Iju Osun, Ore, Oniparaga and Onitea, all in Odigbo Local Government Area of the state.
The commandant said three trucks with registration No EKY 699 XH, XA 995 KMR and JJJ450 XA were recovered from the suspects.
Popoola said the command has since notified the Nigerian National Petroleum Corporation (NNPC) of the development.
He added that the illegal depot and refinery had been destroyed while cars numbering up to 10 loaded with adulterated fuel were also recovered from the suspects.