How to deal with false accusations

my friend have been made accused by filing false FIR. The alleged accused is the salesman having good terms with the owner of a shop. The shop has cctv cameras fitted. One day fire broke out in the storeroom while the owner was sitting with his friend and the salesmen were out of shop. After few days the owner filed an FIR alleging that the particular salesman had splinted the fire. The FIR states his movements half an hour before was suspicious as seen in cctv footage. The owner made some well edited videos from cctv footage and the same is given to police. Also he circulated the videos through social media. Police has seized original cctv recorder. The alleged accused was arrested and after 3 weeks was released by sessions court on bail few days ago. The case is under police investigation. There are reasons to believe from circumstances that the alleged accused is completely innocent and the owner i.e. informant as well as his friend who was within the shop at relevant time had