As far as I know the 1979-Camp David agreement included demilitarization of the Sinai peninsula. To enforce this the United Nations sent in the MFO observers, also taking care of securing the Egyptian-Israeli border. One can`t expect Israels continual effort to stop armed militants to be successfull - so MFO, where are you?
Red Cross delivers aid to Taiz, Yemen, for first time since August (Reuters)
from the article: Egypt-based jihadist group claims border attack on Israeli soldiers