At least 13 persons were killed and four others injured in a road accident in Egypt's capital Cairo, officials said on Monday.A bus overturned on the desert road in Minya province, about 245 km south of Cairo, on Sunday night when one of its tyres exploded due to high speed, Xinhua news agency reported.Statistics from Egypt's Transport Ministry showed that about 10,000 persons are killed every year in road accidents here with over 60 per cent of the accidents being caused by buses.