Gunmen have attacked a bus carrying Coptic Christians in central Egypt, killing at least 28 br br The Copts killed had been travelling to St Samuel's monastery to pray br br Between eight and 10 gunmen wearing military uniforms attacked the convoy br br According to The New York Times, the gunmen ordered the passengers to get out of the bus br br They told the men to recite the shahada, the Islamic declaration of faith br br When the men refused, the gunmen opened fire br br There was no immediate claim of responsibility