Egypt has sent more troops, tanks and armoured vehicles in response to the Sinai border attack that killed 16 soldiers on Sunday. Both Egypt and Israel blame 'militants' in Gaza for the attack. The claim could hurt ties between Hamas and Mohamed Morsi, the Egyptian president. It has also raised concerns over whether Egypt can secure the Sinai region. Guests: Menachem Hofnung, Sameh Fawzi, Ghazi Hamad.