"Whoever kills a soul unless for a soul or for corruption (done) in the land - it is as if he had slain mankind entirely" read the tweet, quoting Surah 5, verse 32 of the Noble Quran.
A series of attacks in North Sinai on Thursday killed at least thirty people, including a number of civilians, Al-Ahram daily reported.
Militant group Ansar Beit Al-Maqdis, affiliated to the so-called Islamic State in Iraq and the Levant (ISIL), claimed responsibility for the attack.
Attacks by militant groups based in North Sinai have spiked since the ouster of former president Mohamed Morsi in July 2013, with security forces being the primary targets.
El-Baradei, the former head of the International Atomic Energy Agency, resigned from his post as Egypt's vice-president for international affairs on 14 August 2013, the day when security forces violently dispersed two Brotherhood-led protest camps in Cairo, killing hundreds. He left Egypt shortly after.