Obviously, the Muslim Brotherhood in Egypt is seen as a threat, in both Egypt and Israel.
Egyptian military activity in Sinai authorized by Israel • Move seen as pre-emption to block Brotherhood supporters, jihadis and weapons from streaming into heartland in potential fight with Egyptian army…
“The Egyptian military activity in Sinai is coordinated with Israeli security elements and authorized at the most senior levels in Israel, in order to contend with security threats in Sinai that pose a threat to both Israel and Egypt,” the IDF said in a statement.
An Egyptian security official in the border area, speaking on condition of anonymity, confirmed that about 50 tanks were deployed in the area overnight.
Sami Abu Jazzar, a Gaza resident, said he could see Egyptian jeeps and armored vehicles across the border. Source: Israel Hayom