British Prime Minster David Cameron today called for adding 1,900 security agents, shutting down Islamic schools in Britain that preach what he called "intolerance", and extending British air strikes against Islamic State to Syria.

In a speech to Parliament, Cameron said the country's "horror and anger" over the Paris attacks must be followed by "resolve and determination to rid our world" of Islamic State, the group which has taken responsibility for last Friday's assaults which killed 129 people.

Cameron also said the the leaders at this week's G20 meetings also agreed to coordinate and tighten security at the world's airports.

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