LONDON (Reuters) – Britain introduced body scanners at Heathrow airport Monday, a measure rushed in after a failed attempt by a Muslim extremist with explosives strapped to his leg to bomb a U.S.-bound passenger plane from Amsterdam.

The scanners, which see through clothes to produce an image of the body, have caused unease among human rights campaigners who fear an invasion of passengers' privacy as well as the disproportionate scrutiny of Muslim travelers by authorities.

"Given the current security threat level, the government believes it essential to start introducing scanners immediately," said Transport Secretary Andrew Adonis.

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