LONDON - The BBC has suffered a sophisticated cyber-attack following a campaign by Iranian authorities against its Persian service, director-general Mark Thompson said on Wednesday.

Thompson also reported attempts to jam satellite feeds of the British Broadcasting Corporation services into Iran and to swamp its London phone lines with automated calls.

In extracts from a speech he will make later on Wednesday, Thompson stopped short of explicitly accusing Tehran of being behind the cyber-attack, but he described the coincidence of the attacks as "self-evidently suspicious".

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