A 21-story apartment building under construction collapsed in an upscale area of Nigeria’s largest city, killing at least three people and leaving dozens more missing, officials and witnesses said on Monday.

Lagos Police Commissioner Hakeem Odumosu confirmed the deaths, but added that three survivors had been pulled from the rubble in Ikoyi by Monday evening. Officials arriving at the scene were confronted by crowds of people venting their anger that rescue efforts started several hours after the collapse.

Olayemi Bello told The Associated Press that five of his friends were trapped in the building and he feared the worst.

A fire fire fighter stand in the rubble of a 21-story building under construction that collapsed at Ikoyi district of Lagos, on Nov. 1.

A fire fire fighter stand in the rubble of a 21-story building under construction that collapsed at Ikoyi district of Lagos, on Nov. 1. (PIUS UTOMI EKPEI/AFP via Getty Images)

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"When they work finish, they will come outside and they will play with us and talk about the work," he said. "Now, nobody. All of them are dead."

Construction worker Eric Tetteh said that he and his brother had managed to escape. But he estimated that more than 100 people were inside the building at the time it crumbled into a pile of debris.

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Workers said the high rise apartment building had been under construction for about two years, and it was not immediately known what had caused the collapse.

However, such incidents are relatively common in Lagos because enforcement of building code regulations is weak. Other observers blame shoddy work by private developers eager to meet demand for housing in the megacity.