At least 21 people were killed, mostly students, and scores more injured on Friday when a school in central Nigeria collapsed on pupils taking exams, the Red Cross and witnesses said.

Trapped students cried for help under the rubble as desperate parents looked for help after the Saint Academy school in Jos North district of Plateau State fell in on classrooms, according to an AFP correspondent at the scene.

Rescue workers tried to reach the victims with heavy machinery and images from the scene showed crowds gathering round a caved-in concrete building and heaps of debris.

Red Cross spokesman Nuruddeen Hussain Magaji told AFP there were "21 fatalities, and 69 injuries all in admission at various hospitals".

Earlier, AFP saw 16 dead bodies in two hospital morgues in Jos. All were wearing school uniforms.

With his mother at his hospital bedside, injured student Wulliya Ibrahim told AFP: "I entered the class not more than five minutes, when I heard a sound, and the next thing is I found myself here."

"We are many in the class, we are writing our exams," he said.

Earlier, the National Emergency Management Agency said the two-storey building housing Saint Academy collapsed killing "several students."

Chika Obioha, a resident at the scene, told AFP he saw at least eight bodies at the site and that dozens more had been injured.

"Everyone is helping out to see if we can rescue more people," he said.

AFP's correspondent said he saw 11 bodies in the morgue at the Bingham University Teaching Hospital and that five dead were taken into the mortuary at the Our Lady of Apostles Hospital in Jos.

At least 15 rescued and injured students were admitted, officials at the Our Lady of Apostles Hospital said.

Officials at the Bingham University Teaching Hospital did not comment.

It was not immediately clear what caused the collapse but residents said it came after three days of heavy rains.

- Frequent collapses -

Building disasters are fairly common in Africa's most populous nation because of lax enforcement of construction standards, negligence and low-quality materials.

At least 45 people were killed in 2021 when a high-rise building under construction collapsed in the upscale Ikoyi district in Nigeria's economic capital Lagos.

Ten people were killed when a three-storey building collapsed in the Ebute-Metta area of Lagos the year after.

Since 2005, at least 152 buildings have collapsed in Lagos, according to a South African university researcher investigating construction disasters.

Bad workmanship, low-grade materials and corruption to bypass official oversight are often blamed.

At least 34 people, including two babies were killed when a contraband fuel depot exploded into flames in southern Benin near the border with Nigeria on Saturday.

According to Beninese Interior Minister Alassane Seidou, “a serious fire occurred in the town of Seme Podji. Another 20 people were seriously wounded in the incident.”

"I can't really give you the cause of the fire, but there is a large gasoline warehouse here and cars, tricycles and motorcycles come from morning to evening,” he added.

Nigeria is a main oil and gas producer where fuel smuggling is very common along its borders, particularly when the government maintains a subsidy to keep fuel prices low.

The majority of the victims were burnt and they could not be not be identified.

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