Kanpur: An assistant commissioner of trade tax died under mysterious circumstances when he was checking a truck here in the district, police said.

Sanjay Srivastava was checking the papers of the truck and found them to be incomplete. He then asked the truck driver to report to Sikandra police station, DM Saroj Tiwari said. Suddenly, Mr. Srivastava turned blue and collapsed. His colleagues thought he had suffered a heart attack and rushed him to a hospital where he died.

However, his post mortem report does not say that he died of a cardiac arrest, Tiwari said, adding further investigations are on in the matter.