LONDON: The security cover for Britain's Princes William and Harry has been stepped up over fears that IRA terrorists are plotting to assassinate the royals, a news report said on Sunday. Scotland Yard fears the Princes, who are officers in the British Army, are prize targets for Irish Republican Army (IRA). The number of close protection officers guarding the two royals on each shift has been increased, Britain's Sunday Express reported today. The threat level has been upgraded following the murders of two soldiers and a police officer in Northern Ireland. "The Princes are regarded as legitimate targets by these...