BMW unveils X4 concept car

BMW has unveiled the concept car that will become the X4 production car in 2014.

The X4 concept works along similar lines to the X6, which is a lower, sleeker version of the X5, but on a smaller scale by taking the X3 as its starting point.

The production version of the X4 will be built alongside the X5, X6 and X3 at BMW's Spartanburg plant in South Carolina. It is expected to share engines with the X3 range.