The newly-appointed BBC Director-General Tony Hall said, "It takes a lot to drag me away from the Royal Opera House ... but the reason I stand before you today is that I care passionately about the BBC, about what it can do, it's programme makers and the impact we have in all different ways".
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The bus was heading to Mombasa and the lorry was travelling in the opposite direction when they collided on Tuesday, say Kenyan police.
"Corbyn himself has said he was a 200-1 outsider for the Labour leadership in 2015 and look where that one went," the PM told supporters.
A father filmed himself killing his baby daughter and posted the video clips on Facebook, before committing suicide, Thai police have said.