Egypt's prosecutor general, Nabil Sadeq, referred 278 suspected Muslim Brotherhood members to military trial Sunday on "terrorism" charges.
Of the 278 people referred for trial, 141 are already in detention.
The suspects are facing charges including joining Brotherhood-linked militant groups Lewaa al-Thawra and Hasam.
They are also accused of carrying out 12 "terrorist operations" including targeting and killing police officers 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.
