Massive boulders weighing dozens of tons crashed down on an Egyptian shantytown Saturday on the outskirts of the capital, killing at least 24 people, AP reported. At least eight boulders, some the size of small houses, peeled away from the towering Muqattam cliffs outside Cairo and buried some 50 homes in the sprawling Manshiyet Nasr slum, one of the shantytowns ringing Africa's most populous city. The collapse occurred in the early morning. A security official said 35 people were injured and many people are believed to be buried under the hundreds of tons of rock that fell. He spoke on condition of anonymity because he was not authorized to speak to the press.