A Kenyan broadcaster has lodged an official complaint after video images of the president's wife slapping an official were seized and erased.
Nation TV filmed Lucy Kibaki slapping the official during an independence day celebration at State House in Nairobi.
He had mistakenly introduced Kenya's first lady by the name of the woman widely alleged to be her love rival.
In 2005, Mrs Kibaki was accused of slapping a cameraman in a protest over coverage of her row with a neighbour.
This gaffe comes at a sensitive time as Kenya prepares to elect a new president in two weeks.
Embarrassment
When the official from the president's office mistakenly introduced the first lady by the name of the woman widely believed to be President Mwai Kibaki's second wife, Mrs Kibaki marched up to him and promptly slapped him around the face.
