How Christians are identified in Egypt

The Arab Spring in Egypt is resulting in riots and persecution targeting Coptic Christians, who make up some 10% of the population. This weekend some 17 were killed.  See  this.

So how can Egyptians tell if one of their countrymen is a Christian?  Well, in an act of defiance and self-identity and so everyone will know their religion, the Copts wear their faith on their sleeve, as it were.  They tattoo a Coptic Cross on their wrists.  (We blogged about this before, but I found a picture.)