At least 12 people died when a building collapsed in Nairobi, officials said yesterday, as rescuers scrambled to find more survivors after torrential storms which killed another seven people. President Uhuru Kenyatta visited the ruins of the six-storey building, where residents perished after concrete floors collapsed down on top of each other during heavy rainstorms on Friday. The two-year-old building, home to more than 150 families, had been condemned by building authorities but the order to evacuate it had been ignored. "So far 12 people have been confirmed dead from the ... tragedy," a government statement said. The building came down at around 9.30pm (1830 GMT) Friday following some of the heaviest downpours since the start of the rainy season that caused flooding and landslides in many areas of the city. Two neighbouring buildings were declared unsafe and were evacuated. Seven other people died in floods elsewhere in the Kenyan capital, including four killed when a wall collapsed. Kenya Red Cross said that over 50 people had been reported as missing. However, there was no confirmation that they were trapped inside the building. Heavy rainstorms are predicted to continue overnight, the Red Cross saying rescue efforts were expected to continue, "probably running into days." Access for rescuers with larger machinery has been made difficult by the narrow and crowded streets. One survivor was pulled from the huge pile of debris shortly after dawn, Kenya Red Cross said, some 10 hours after the building collapsed Friday night. Pictures broadcast by local media showed soldiers, policemen and civilians searching through the rubble. Kenyatta "braved the rainy and chilly weather" to visit the poor and densely-populated Huruma neighbourhood, a statement from the presidency said. He ordered police to "take immediate action to identify and arrest owners of buildings who have ignored directives by the National Construction Authority," it said. In other separate incidents, two people drowned when their vehicle was swept away by storm waters in the capital's Industrial Area, and another person died in floods. Nairobi has been in the midst of a building boom for some years but the quality of materials used and speed of construction have sometimes been called into question. The growing middle class has triggered an explosion in demand for housing and a rise in real estate prices in the east African capital.