Former National Security Agency contractor Edward Snowden, who is reportedly booked on a flight from Moscow to Cuba, could travel from Havana to the Venezuelan capital, Caracas, according to news agency Itar-Tass.
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The hotel chain said three of its properties - in Maidenhead, Brentford and Tottenham - have been investigated during a detailed assessment
In its first response since the 22-year-old's death, North Korea said Mr Warmbier was treated "according to international standards".
Police would face "real challenges" tackling a repeat of the London riots after years of cuts, one of Britain's most senior officers warns.