The massive security campaign that began on Friday covers north and central Sinai and parts of Egypt's Nile Delta and the Western Desert, along the porous border with Libya which authorities contend that Islamic militants and smugglers use as their route into the country.The operation involves land, sea and air forces.
Authorities are not saying how long the operation will last.
Earlier today, the army said that airstrikes in the Western Desert destroyed 10 SUVs laden with weapons and ammunition.
Egypt has for years been struggling to contain the insurgency concentrated in north Sinai, spearheaded by a local affiliate of the Islamic State group.
Militant attacks have generally surged since the 2013 military ouster of elected Islamist President Mohammed Morsi following mass protests against his divisive one-year rule. The violence has also spread to the mainland.