CAIRO (updated) A major blaze has hit a marketplace in a slum area south of Cairo where at least three people are believed to have been burnt to death. Dozens have sustained burns and were hospitalised, according to eyewitnesses. Firefighters and parademics rushed early Tuesday to the scene in the area of el-Tonsi near Islamic Cairo where efforts are still under way to bring the blaze under control. The cause of the fire is not known. The Egyptian capital, populated by around 14 million, is teeming with shantytowns. In 2008, more than 100 people in a poor area in Cairo were crushed to death when boulders fell on them.