John Kerry, who has been officially sworn in as the new US Secretary of State, said America would "do what was necessary" to stand up to "extremism, terrorism, chaos and evil".
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Ricardo Medina is charged with stabbing his flatmate to death with a sword.
Police are hunting a man who is suspected of grabbing an 11-year-old girl who only got away by biting her attacker's hand.
The storm is expected to hit the country's southern coast on Monday.