A 34-year-old man, who is understood to have launched the knife attack, drove a car into the side of the Alliance pub in Manchester.
He was taken to hospital suffering from a stab wound and injuries consistent with a collision but died a short time later.
More top news
Mr Osborne said he is "not the person to provide the unity my party needs".
Actress Lena Dunham has criticised Kanye West's "disturbing" new music video for depicting a host of naked celebrities in bed together.
David Cameron is to meet leaders of other EU states for the first time since the referendum vote for Brexit.