A building containing a primary school has collapsed in the Nigerian city of Lagos and pupils are feared to be among the dead and injured.
The school is said to have been on the top floor of the three-storey building in Ita Faji on Lagos island.
Pictures from the scene showed rescuers climbing over piles of broken concrete and twisted metal.
There is no word on casualties yet. Local media say it is a residential building with several apartments.
The cause of the collapse is not yet clear
The BBC's Aliyu Tanko in Lagos says emergency teams are pulling injured people from the rubble.
Some worried parents have arrived at the scene while others have gone to a local hospital to look for their children, he adds.
It is not unusual for buildings to collapse in Nigeria.
Materials are often sub-standard and there is weak enforcement of regulations, correspondents say.
In 2016, more than 100 people died when the roof of a church in Uyo, in the south of Nigeria, caved in.
Have your say
More World Headlines
- Utrecht shooting: Several hurt as man opens fire in tram
- Cyclone Idai: Devastation in Mozambique and Zimbabwe
- Cyclone Idai sweeps across Zimbabwe, killing dozens
- US puts $1m bounty on Osama bin Laden's son
- Biden 'mistakenly' announces he's running
- Soil offered to Ethiopia jet families
- Suspect in New Zealand shooting charged with murder
- Deadly cyclone tears into Zimbabwe
- 49 dead in New Zealand mosque attacks
- DR Congo MPs elect senate amid vote buying scandal
- Senate Republicans revolt against Trump over border
- Scandal over Kenya's border fence that cost $35m for just 10km
- 16-yr-old Swedish girl up for Nobel Peace Prize
- 'Worst-case' cyclone hits Mozambique
- California jury awards $29 million to woman with cancer who used J&J talc