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Questions raised over effectiveness of Trident nuclear deterrent system

Washington (CNN) A missile test involving Britain's Trident nuclear deterrent system ended in failure off the coast of Florida last year, a US defense official with direct knowledge of the incident told CNN on Monday.

The official told CNN that the incident, which happened last June in an the area off the Florida coast used by the US and the UK for missile tests, did not in involve a nuclear warhead.

Britain's Sunday Times newspaper reported that the missile veered towards the US coast, but the US official told CNN that this trajectory was part of an automatic self-destruct sequence. The official said the missile diverted into the ocean -- an automatic procedure when missile electronics detect an anomaly.

A month after the test, the UK parliament approved the renewal of Trident at a cost of £40 billion. Unaware of the failure, members of the House of Commons voted by 472 votes to 117 in favor of renewal.

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