'Many people are inside': Building collapses in Nigeria, trapping workers – video

A residential high-rise building under construction in Nigeria's commercial capital Lagos collapsed, trapping up to 100 workers under a pile of concrete rubble. The building was in the affluent neighbourhood of Ikoyi, where many blocks of flats are under construction. Building collapses are frequent in Nigeria, Africa's most populous country, where regulations are poorly enforced and construction materials often substandard.

• Up to 100 missing after 22-storey tower block collapses in Lagos