As the cardinals enter into the Conclave, they swear an oath to secrecy concerning the events of the Conclave.

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So critical was the Norden bombsight that its operators had to swear to protect it at all costs from falling into the hands of the enemy.

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President Kumaratunga refused to swear in SB Dissanayake as the welfare minister, because of an inquiry into his activities as the welfare minister in the outgoing government.

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The investigation into Coke's finances comes after US firms have been forced to swear before the regulator that their accounts are accurate.

BBC: Coke hits back in fraud probe