Staff Reporter NEW DELHI: Delhi BJP president Harsh Vardhan on Monday demanded a probe by the Central Bureau of Investigation into purchase of 625 non-air-conditioned low-floor buses by the Transport Department of the Government on the ground that these buses had been purchased for Rs.41.74 lakh each from Tata Motors while the Tamil Nadu Government had purchased similar buses for Rs.16.80 lakh each from Ashok Leyland Limited for Chennai. Alleging that the purchase at higher rates had resulted in a