Many pupils are feared dead and trapped following the collapse of a three-story building housing a private school in Ita Faji area of Lagos Island, Lagos State.
Workers from the Red Cross and police shovelled debris away as thousands of people swarmed around the accident site, before heavy lifting equipment began to arrive.
As residents of the area trooped to the site of the crumbled building, an unnamed distressed lady who reportedly took her aunt's child to the school earlier in the morning was spotted weeping bitterly after the tragic incident. The structure also contained offices and residential units.
Emergency and rescue personnel are seen at the site of a building which collapsed in Lagos on 13 March 2019.
With rescue and recovery operations continuing into the night, total death toll of victims and survivor count have not been finalised.
TVCNEWS.TV has gotten reports from its correspondent, Theophilus Elamah who tells us that 12 persons have been confirmed dead while 42 injured are now receiving treatment.
The building housed a school with about 100 pupils, they added.
It's not known how many people lived in the apartments that made up the rest of the complex.
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Also reacting to the incident, Lagos State Building Control Agency LASBCA, said the building that caved in had been marked for demolition since past year because it was discovered by the Agency to be distressed.
"I want to commiserate with the families of those that lost their lives in this collapsed building", the governor said in a post on his Facebook page that also urged onlookers to "give the rescue workers the chance to save more lives".
As rescuers worked furiously to reach those inside, distraught parents begged them to find their children.
Video from the scene showed a dust-covered child being carried out of the rubble, to cheers.
Rescue efforts unfolded in the densely populated neighbourhood in Lagos, Nigeria's commercial capital and a city of some 20 million people.
Nigeria is frequently hit by building collapses, with weak enforcement of regulations and poor construction materials often used.
Over 100 people died in 2016 after a church roof collapsed in the south of Nigeria.