The gunman in yesterday's shooting at a Colorado school is believed to have acted in retaliation for disciplinary action against him by the debate club coach, according to Reuters.
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PM spokesman's comments come following reports that the EU is secretly drawing up plans for greater military cooperation across the EU.
The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.