Forty-three others were wounded in the attack, which happened during a new
year's service at the al-Qiddissin (Saints) Church shortly after midnight.
Coptic Christians and Muslims clashed after the attack, but police moved in
and used tear gas to restore order.
President Hosni Mubarak urged Egyptians to unite against "terrorism".
In a televised statement he blamed "foreign hands" for the bombing. "Wicked
terrorists targeted the nation, Copts and Muslims," he said.
"It is a terrorist operation that is alien to us... We will all cut off the
head of the snake, confront terrorism and defeat it."
Earlier, officials said the attack had been caused by a car bomb.
Foreign connection?
So far no group has said it carried out the attack.
The Islamic State of Iraq, a militant umbrella group that includes al-Qaeda
in Iraq, had recently threatened Christians in Egypt.
It cited the case of two Egyptian Christian women who reportedly converted to
Islam in order to divorce their husbands. The group said the women were being
held against their will by the Coptic Church.
via www.bbc.co.uk
Egypt has long been one of the most stable countries wherein Christians have coexisted with Islam and other religions. In this case sugestions of Iraqi inflence has been posed.