Tragedy struck around midday at Itafaji, Lagos Island, when a 3 storey building housing a school collapsed, reportedly killing and trapping many.
Many people including school children are believed to be trapped inside a building that collapsed on Wednesday.
Onlookers crowded around in the densely populated neighborhood in Lagos, Nigeria's commercial capital and a city of some 20 million people.
They were rescued by residents of the area who gathered the site, as well as officials from Emergency rescue agencies.
He said: "It is believed that many people including children are now trapped in the building".
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Workers on top of the rubble shovelled debris away as thousands of people swarmed around the rescue site - dozens watching from rooftops and hundreds more packed into the surrounding streets.
Emergency and rescue teams are now at the scene of the incident, Pulse has learnt.
The same year, 30 people died when a five-storey building, under construction, collapsed in Lagos.
Building collapses are all too common in Nigeria, where new construction often goes up without regulatory oversight.
The structure is reported to be a residential building with several apartments.