People spray water on a child who was rescued at the site of a collapsed building containing a school in Nigeria's commercial capital of Lagos, Nigeria, on March 13, 2019.
The Lagos emergency management agency said 10 people had been recovered alive since emergency responders arrived, and others beforehand.
A three-storey residential building collapsed on Wednesday in a densely-populated part of Lagos, and local media said there could be many casualties, including schoolchildren.
The total number of deaths from the incident remains as yet unknown, but it is sure to be more than eight people now reported by emergency agency officials.
The incident took place near Itafaji market on Lagos Island in Nigeria's economic capital at around 10am (0900 GMT).
"Above all, we must all take appropriate lessons and learn from this sad incident", he said. But many more are trapped under the rubble, including dozens of children.
Speaking on the incident, the Lagos State Management Agency (LASEMA) said search-and-rescue operation would continue till all those trapped are rescued.
Lagos state Gov. Akinwunmi Ambode said the building, which had been marked for demolition, was classified as residential and the school was operating illegally on the top two floors.
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Salami said: "It was because of the situation of the building that forced me to resign from the school in December because I don't want to risk my life".
It was not immediately clear how many people were inside at the time of the collapse, nor were there any figures for the tally of dead or injured. The school had more than 100 students, rescue officials said.
Sunday said his family lived on the second floor of the building and he sent his boys to school there so they wouldn't have to travel far.
"We cleared it out to see if anyone was still buried below this rubble". In 2016, more than 100 people were killed when a church came down in southeastern Nigeria.
"If the structural strength is too weak, it should be recommended for full or partial demolition, in which case there must be compensation from the government that approved the building plans" he said.
A neighbour, Adewale Owoso, likened the moment the building collapsed to a bomb explosion.
Miss Bukola Salami, a former teacher in the school housed in the ill-fated building, said the owner of the learning institution had been told to move out, but resisted on account that she had no money to rent another apartment.
Building collapses are frequent in Nigeria, where regulations are poorly enforced and construction materials are often substandard.