Lagos, Nigeria (CNN)Around 8 a.m. on Wednesday, Adedayo Adedoyin waved her 6-year-old twin son and daughter off as they took the short walk to their school, a few meters away from their home in Lagos Island.
Boy, 6, dies and his twin sister is fighting for life after Lagos building collapse
An hour later, she heard anguished screams outside. A nearby building had collapsed, and her children were inside it.
Adedoyin raced to the scene, where a small crowd had gathered and a search had begun for survivors among the rubble of the aging three-story building that had given way without warning, trapping residents, pupils and small goods traders inside.
The building had been marked for demolition at least three times, a buildings expert said in an interview with the Nigerian News Agency.
He added that there are many similar buildings in the Lagos Island area that are also at risk.
"There are over 1,000 distressed other buildings of this nature in Lagos, which, if nothing is done to demolish them, they will still collapse, resulting to more calamities in the state," said Kunle Awobodu of the Building Collapse Prevention Guild.
"The collapsed building had been marked for demolition about three times, but the building regulatory agency has not demolished it," Awobudu said.
Members of the Lagos Island community joined forces with rescuers from the Lagos State Emergency Management Agency to pull mostly children out of the rubble.