Flow past buildings can be studied by investigating flow past prismatic bodies placed on a base plate and kept in a simulated boundary layer. This investigation examines the effects of interference of two bodies in tandem, on the velocity field and turbulence intensities in the plane of symmetry. The two bodies have square cross-section of side b and have height (h) to width ratios of 1 and 5. The shorter body is kept behind the taller body at distances of 2b, 3b, 4b and 8b. Flow past individual body is also reported. In the case of interference, the flow pattern depends on whether the reattachment of the flow separating from the tall body takes place ahead, on or behind the short body. Due to three-dimensional effects some novel features are observed in the near wake. The presence of the short body influences the flow behind the tall body up to 3 body widths. The detailed data is expected to be useful for validating computer codes.