VW scandal: two simple questions, two complex answers

The US Congress hearing into the emissions-rigging scandal mixed frustration with incredulity at answers from Volkswagen's US CEO Michael Horn

Despite Volkwagen's congressional hearing lasting more than two hours and the carmaker's US boss facing almost constant criticism, Congress was only fixated on a pair of questions - who is to blame for the diesel emissions scandal and how are you going to fix it?

Unfortunately for Michael Horn and VW, the energy and commerce committee in Congress was not satisfied with either answer.