A school student who went on a shooting spree before killing himself wrote a series of chilling tweets in the months before he ran amok with a gun.
New York and New Jersey are to begin automatically quarantining medical staff who return from areas badly affected by Ebola.
Former Prime Minister Tony Blair has denied saying that Labour leader Ed Miliband cannot win the next General Election.
A senior Google executive has set a new record for the highest parachute jump at more than 135,000 feet (41,000 metres).
More than 800,000 refugees have crossed the border into Russia since the start of the year, according to the UN's refugee agency (UNHCR).
Johann Lamont has resigned as leader of the Scottish Labour Party, after claiming her colleagues "do not understand the politics they are facing".
Egypt has declared a three-month state of emergency on the Sinai Peninsula after a suicide car bomb attack killed more than 30 soldiers.
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Police have released "appalling" footage of a blind man being pushed on to a train track as his two attackers are jailed.
Police say remains found in a dried-up creek in rural Virginia are those of British-born student Hannah Graham.
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