The light aircraft crash in which two people are feared to have died occurred in a field in a rural area between two villages a few miles outside Chelmsford in Essex.
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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.