Allegedly a Christian lady married a Muslim and converted to his faith. Some Christians believed it was not voluntary, and, allegedly kidnapped/rescued her and took her to a church in the town of Imbaba where, in theory, she remains (voluntarily or not). Muslims, acting on behalf of the husband, went to the church to demand her release. A lethal riot ensued.
I wouldn't find this particularly noteworthy save it might be a pretext for imperial intervention. The Egyptian military has not yet been successful in quelling protests and putting an end to the revolution. The people of Egypt, hurrah, have not given up and are defying the ban on demonstrations and strikes etc.
This conflict in Imbaba may be nothing more than it seems-squalid sectarian lunacy--but it may be something even darker.
Will keep an eye on it.