"Texas is bound not by the World Court, but by the US Supreme Court, which reviewed this matter and determined that the convicted murderer's execution shall proceed, " the statement said.

BBC: Court seeks to stay US executions

"The banks are of the clear view that their proposals are superior for ABN Amro's shareholders and are straightforward from a shareholder, regulatory and execution perspective, " the Royal Bank consortium said in a statement Wednesday.

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In a statement, the Sri Lankan foreign ministry said that President Rajapakse and the government deplored the execution "despite all efforts at the highest level of the government and the outcry of the people locally and internationally".

BBC: Sri Lankan maid Rizana Nafeek beheaded in Saudi Arabia