An ambush attack in the Sinai peninsula killed 24 Egyptian policemen  on Tuesday morning, officials say.
The policemen were travelling by bus when they came under attack from armed men close to the Rafah border with Gaza, security forces told BBC.
Several of the police forces were injured in the attack.
According to security sources who spoke to BBC, four armed men stopped the police buses and forced the passengers out of their vehicles before shooting them.
The Egyptian military has recently launched an intense crackdown on militias in Sinai, where there has been a surge of attacks since former Egyptian president Hosni Mubarak  was ousted in 2011.
The deployment of Egyptian troops in Sinai are subject to the 1979 Camp David peace treaty between Egypt and Israel , BBC reported.