Armed police were on the runway at Manchester Airport after a Qatar Airways flight landed with an RAF escort.
A passenger on board the flight tweeted:
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It was a cloudy start across many eastern areas first thing. However, Sunday shaping up to be a warm sunny day for most.
Former Work and Pensions Secretary Iain Duncan Smith has David Cameron should remain prime minister even if Britain votes to leave the EU.
Tony Blair has said Leave campaigners are focusing on immigration "because they've lost comprehensively the debate on the economy".