A mail van heading towards Patel Chowk was completely damaged when it suddenly caught fire near the Reserve Bank of India building here on Monday evening. According to fire officials, the incident took place around 5.40 pm in Sansad Marg and the driver of the van stepped out of the vehicle when he saw smoke emanating from the engine. Several fire tenders were rushed to the spot and the area was cordoned off by the police. The operation is underway.