Crown Prince Felipe, 46, will take over the Spanish throne following the abdication of his father, Juan Carlos I.
Spain's Prime Minister, Mariano Rajoy, said a new constitutional amendment would be proposed to allow Juan Carlos to abdicate.
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In a rallying call at the Democratic National Convention, the former US president said Hillary is 'the best darn change-maker I ever met'.
Satoshi Uematsu, 26, was sent to the Yokohama District Public Prosecutors Office in Kanagawa prefecture.
West Yorkshire Police confirmed a 32-year-old woman was taken into custody in connection with the alleged threats.