"This is the first time since the revolution that they transferred anyone to a state security court," said Emad Gad of the Al-Ahram Center for Political and Strategic Studies.
"There is already a bad security situation in the country with crime rising. They (the ruling generals) are taking advantage of this," he added.
Activists and opposition parties have disowned the violence around the embassy which they say sullies the uprising's goals.
But the revival of courts under emergency law will be just as worrying. Some of the demonstrators who moved on the embassy had come from a protest on Friday in Tahrir Square where one of the demands was scrapping the hated emergency laws immediately.
Analysts say Egypt's democratic transition could suffer and some already see worrying signs of a slow return to the kind of tactics used by Mubarak's security forces to stifle opponents.