A three-story building under construction in Lagos, Nigeria's commercial capital collapsed Friday, killing at least two workers and trapping scores more, according to news reports.
Construction workers told national radio that concrete pillars supporting the structure in Lagos' Aja neighborhood gave way without warning.
About 100 workers were in the building at the time.
Two bodies were recovered from the rubble, but the casualty toll was expected to rise as search efforts continued. Seventeen workers escaped alive, but it was not immediately clear how many were injured.
Building collapses are common in Lagos, with high rents and lack of inspectors. Builders are frequently accused of using substandard materials.