A former top US official has told a Congressional hearing in Washington billions of dollars have been wasted on developing a US missile defence system.

Philip Coyle, who used to be in charge of weapons testing at the Pentagon, said the threat used to justify the system was exaggerated.

Another witness said the missile system offered no prospect of defending the US from a real attack.

The US says the system will protect against missiles states like Iran.

However, plans to site the shield in central Europe have soured US-Russian ties. Moscow fears it could be used against Russia.

Threat 'exaggerated'

"Missile defence is the most difficult development the Pentagon has ever attempted," said Mr Coyle.

The threat being used to justify the large sums being spent has been exaggerated, he said, "and if it were real the proposed missile defence systems couldn't deal with it anyway".

Another witness, Lisbeth Gronlund, co-director of the Union of Concerned Scientists' Global Security Program, told the hearing the US was no closer to being able to "effectively defend against long-range ballistic missiles than it was 25 years ago".

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Source (British): BBC