Pretty sure that the National Guard doesn’t have that expertise. Although I guess they may have been used at WACO with their tanks and APC’s, etc.
I’m guessing that the Egpytian Police is more like our military. They probably have automatic weapons and fairly heavy vehicles.
And as the earlier poster said - probably people in the department that side with the militants. I’m guessing it would be difficult to make it an all Christian (and/or Jewish) police force in Eygpt.
The officials said what happened next is not clear, but added that the force likely ran out of ammunition and that the militants captured several policemen and later killed them.
I think that was the FBI....(?)