Mathura, Dec. 20 -- The first confidential investigation report running into 66 pages has been submitted into the deadly accident on the Yamuna Expressway in Mathura, in which 19 people were burnt alive. The report squarely holds officials of the Yamuna Expressway Authority responsible for the tragedy and identifies the accident site as a "black spot."According to the report, the stretch of road where the accident occurred is low-lying and curved, making road signs invisible during foggy conditions.

Investigators noted that road markings had not been painted for long distances, there were no streetlights installed, and reflectors were ineffective in dense fog. The absence of CCTV cameras at the site also made it difficult to accurately rec...