Karsten Warholm has smashed the European 400m hurdles record again, recording the second-fastest time ever as Thomas Barr finished sixth in the Diamond League Final at the Weltklasse Zurich meeting.

Ireland’s Thomas Barr has produced his best performance of the season in finishing second at the Bislett Games – as world champion Karsten Warholm sensationally smashed the long-standing European 400m hurdles record.