A police officer directs the evacuation of the centre in Dallas
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'Tight security' at US cartoon conference in Dallas

Two gunmen have been shot dead after they opened fire outside a conference on cartoons of the Prophet Muhammad in a suburb of Dallas, US police say.

A security guard was also injured. Police sealed off the Curtis Culwell Center in Garland and evacuated participants.

The event, organised by a group critical of Islam, was offering a cash prize for a drawing of the Prophet.

Eyewitness Stephen Perkins said there had been a high level of security at the event.

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