Four cars stolen from Navi Mumbai were found in Ahmedabad and Surat, providing the anti-terrorism squad leads in the investigation into the Ahmedabad blasts. The anti-terrorism squad (ATS) was banking on the CCTV footage at a toll checkpost in Thane to identify the men who had driven these cars to Ahmedabad. But the investigation has hit a roadblock after it was found that the cameras don't really work.