President Obama speaks during a summit on cyber security and consumer protection
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US President Barack Obama: 'We have to make cyber space safer'

US President Barack Obama has urged technology companies to give the government greater help to improve cyber security.

At a White House-sponsored meeting at Stanford University, Mr Obama said cyber threats posed a challenge to national security, public safety and the economy.

He called on private companies to share more information with each other, and the security services.

Laura Trevelyan reports.

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