Iranian police have closed down 24 Internet cafes and other coffee shops in as many hours, detaining 23 people, as part of a broad crackdown on immoral behaviour in the Islamic state, official media said on Sunday.

Many young Iranians are avid users of the Internet, some using chat rooms to socialise with the opposite sex. Mingling between sexes outside marriage is banned and many Web sites considered unIslamic are blocked by the authorities.

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