Dutch police say they have arrested a man who says he wrote the Anna Kournikova computer virus which clogged e-mail systems around the world this week.

They said the twenty-year-old man from the northern province of Friesland, turned himself in.

He allegedly posted a letter on the web on Tuesday saying he was the creator of the virus which was disguised as a digital photo of the Russian tennis star Anna Kournikova.

He said it was a warning to internet users to tighten their security.

The man, who has been released pending a court appearance, could face a prison sentence of up to four years.

From the newsroom of the BBC World Service