That's another very good question.
What's taking place on the streets in Egypt is coming to us through a variety of news sources and reports, including social media. Some violence by larger groups is being attributed to predominantly Muslim extremist groups, and some to the military. Reports of that violence have been documented largely through video, in addition to the spoken word, or through other photographs that provide visual identifiers of those who are engaging in the harmful actions.
The word we have, as I shared earlier, seems to indicate that it's more a display of power taking place now between Muslim extremists and the military, which currently controls the government as an election period approaches. I would note that there were historic differences between faith communities, but very rarely had they escalated to the level of frequency or volume of violence that's taking place now.