Amazing pictures....
See how many riot police were gathered after the devastation.
I am sure their presence (more than the handful present at the time) would have prevented this. I also think this will be a wake-up call to the authorities that rely on the International Christian communities and those of other faiths which visit Egypt as tourists, as well as the Coptic Nationals who now find themselves targets.
We ex-pats, investors and visitors to Egypt hope there will not be a knee-jerk reaction to this which could inflame the situation further.
Alan.