The African Union voiced shock at what it called the violent treatment of migrants leading to deaths and injuries. Morocco and Spain have denied using excessive force.
The Falcons will take on Botswana on July 7 and Burundi on July 10 in group phase matches.
Minister of Police Bheki Cele, who led a national delegation to the scene, said the victims were both girls and boys, including a 13-year-old.
Mr Mahamat expressed “shock at the violent and degrading treatment of African migrants attempting to cross into Spain.”
“This treacherous act will not pass without a response,” said Sudan.”
“When you look at their faces, you realise that you are dealing with kids. You have heard the story that they are young, but when you see them, you realise that is a disaster.”
The African Development Bank Group (AfDB), says it is implementing infrastructure projects worth $11.5 billion in West Africa.
The athletes will be competing in four events at the trials and nine of the athletes have so far qualified for the world championship.
The competition is scheduled for Morocco from July 2 to July 23.
Opposition leader Ousmane Sonko said three people were killed in the June 17 protests, one in Dakar and two in the southern region of Casamance.
