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The government said 13 children had been wounded during the raid on the bilingual school in the town of Kumba — seven of them seriously.
Around 10 people on three motorbikes burst into the compound of the private Mother Francisca International Bilingual Academy, said Sadi.
They “coldly opened fire on the pupils who were in the classrooms”, he added.
A statement on Saturday from the local UN Office for the Coordination of Humanitarian Affairs (OCHA) said the assailants had also used machetes.
African Union Commission chief Moussa Faki Mahamat condemned the attack in a statement on Twitter late Saturday.
“There are no words for the grief, nor condemnation strong enough to express my horror at the brutal attack…,” he wrote.
Opposition leader Maurice Kamto denounced what he described as “an absolute horror”.
Doctors Without Borders (MSF), whose staff were treating some of the wounded, described the attack as “a reprehensible and indecent act”.
“Civilian structures including schools and hospitals must not be targets,” said Alberto Jodra Marcos, MSF emergency coordinator in the region.
‘Anger and fear’
“What happened yesterday is beyond anyone’s comprehension,” Jodra Marcos told AFP.
“There is anger, but there is also fear regarding what is going to happen now. the violence is going to intensify and the civilian population will be in the middle of it, unfortunately,” he added.
On Sunday, a small crowd of people, mainly women, gathered in Kumba, to march and protest against the killings.
Sadi said the aim of the attackers had been to stop the return to schools that had been taking place in the Northwest and Southwest provinces, where English-speaking separatists are fighting for independence.
The two English-speaking regions in the mainly francophone country have become the centre of the conflict, with separatists targeting the army and demanding local government offices and schools close.
Rights groups have accused both the separatists and government troops of having killed civilians during the conflict since 2017.
The fighting has claimed the lives of more than 3,000 people and forced over 700,000 to flee their homes.
Last year, two students were killed by separatists in Buea, the capital of Southwest region in what an official described as “reprisal” for opposing the forced school closures.
In 2018, insurgents killed a principal, mutilated a teacher and attacked several high schools.
“Around 700,000 young people have been out of the school system because of the conflict,” International Crisis Group analyst Elvis Ntui told AFP.
“The government and English-speaking civil society had put a lot of pressure on the separatist groups to let their children return to school, and some that had been closed for years had begun reopening,” he added.
Separatists have also increasingly resorted to kidnappings and extortion, along with attacks on troops and police, and arson assaults on public buildings and schools.
The government has responded with a crackdown, deploying thousands of soldiers.