The motive behind the attack on the US ambassador to South Korea is unknown, according to the State Department in Washington.<br /><br /> The US Secretary of State John Kerry, speaking in Saudi Arabia, vowed that his country would never cede to threats.<br /><br /> Mark Lippert says he’s recovering well after surgery to treat wounds to his face and arm following the knife assault at a breakfast forum in Seoul.<br /><br /> He needed 80 stitches to close the gash in his face.<br /><br /> The 42-year-old was also treated for a puncture wound on his wrist and is expected to remain in hospital for three to four days. <br /><br /> South Korean police showed off the knife – about 25 centimetres long – said to have been used to attack the ambassador as he shook hands. <br /><br /> The man identified as 55-year-old Kim Ki-jong is a member of the pro-unification group that hosted the event, and had previously been arrested in 2010 for trying to attack a Japanese official. <br /><br /> As he was constrained and taken away following the knife attack he shouted that
