3 July 2012 Last updated at 14:19

De Villota crash 'terrible' says witness

BBC Cambridgeshire presenter Chris Mann describes the "terrible moment" F1 test driver Maria de Villota crashed during testing in Cambridgeshire on Tuesday.

The Marussia driver has suffered life-threatening injuries after her MR-01 race car hit a support truck at Duxford airfield.

Mann, who witnessed the crash, says De Villota "appeared to be unconscious or unable to move for quite some time".