The jihadists have quelled opposition, but some say attention to daily needs is dimming prospects of recapture.
The wave of attacks was one of the most sophisticated assaults on Egypt’s powerful army in decades.
The massive remote-control explosion targeted the prosecutor’s convoy.
The Islamic State asserted responsibility for the killings in Sousse, which left dozens dead.
Detainees can wind up in court or dead as officials quash dissent, according to rights advocates.
The attack was the first in the area, one of the country’s major tourist destinations, in 20 years.
Chaos following the Arab Spring uprising in 2011 has allowed militants to seize a foothold in the oil-rich nation, which could provide an opportunity for launching attacks elsewhere in North Africa.
The oil-rich kingdom is asserting a stronger role in the region amid fear of weakening support from the U.S.
Russian President Vladimir Putin landed in Egypt on Monday, calling on fellow strongman and Egyptian President Abdel Fattah El-Sissi