The President, Muhammadu Buhari has expressed “deep sorrow” over the death of at least 60 people who died after the roof of a church collapsed during the ordination service for a Bishop in Uyo.
Some reports put the number much higher, with many people believed to be still trapped under the debris.
Hundreds of people were inside the Reigners Bible Church including Akwa Ibom state governor Udom Emmanuel, who survived the disaster.
The church was still under construction and workers had rushed to complete it for the ordination, witnesses said.
The governor said there would be an investigation into whether safety standards had been compromised.
Pictures from the scene show collapsed metal girders and corrugated iron sheeting.
A rescue official quoted by AP news agency said 60 bodies had been recovered but the toll could mount as a crane removes the debris.
An unnamed survivor quoted by Nigeria’s Channels TV said: “Normal church service was going on.
“It was about 20 minutes after the governor arrived. Suddenly, the roof fell on worshippers. The governor was quickly rescued. But others were not that lucky.”