African Nations Cup organisers came under fire on Thursday for playing the wrong national anthem at the start of a match for the second time in the tournament.
Nigeria were the latest team to suffer the indignity of having to stand and listen to an unknown tune although such were the catcalls and jeers from the 60,000 Tunisian crowd at Wednesday's semi-final at Rades that it was unlikely the team heard much of it.
The organisers eventually discovered the correct anthem and, bizarrely, ordered both teams to line up again at the start of the second half while it was played out to another chorus of boos and whistles.
"It was insulting," Nigeria coach Christian Chukwu told AFP on Thursday.
"It was a deliberate attempt to destablise the team. Even when the right one was played after half-time, we still couldn't hear it because of the whistling by the crowd.
"They showed a lack of respect and it is not acceptable."
Wednesday's embarrassment was not the first time the organisers, who are still hoping to be named hosts of the 2010 World Cup, had been left red-faced by an anthem mix-up.
In the first round, Zimbabwe protested at an old national anthem being played in their opening match with Egypt in Sfax.
Zimbabwe Information minister Jonathan Moyo was outraged and, like Chukwu, insisted it had been deliberate.
"It was a cheap attempt by the organisers to demoralise our boys," said Moyo.
Tunisia's football federation were fined 1,000 dollars (790 euros) after their team's supporters roundly booed the Senegal national anthem before the start of Saturday's quarter-final which was also staged at Rades stadium.
"The fine was for the public's anti-sporting behaviour in whistling the Senegal national anthem," said a spokesman.