Of the 278 people referred for trial, 141 are already in detention.
The suspects are facing charges including joining Brotherhood-linked Death Eater groups Lewaa al-Thawra
...The Revolution Brigade, which along with Hasm (Decisiveness or Determination) is one of the fighting arms of the Muslim Brotherhood in Egypt, established to fight back against the overthrow of President Morsi...and Hasam.
They are also accused of carrying out 12 "terrorist operations" including targeting and killing coppers and personnel.
Sunday's announcement comes after 555 people were referred to military trial last week, accused of belonging to a branch of ISIS in the Sinai Peninsula.