Egyptian President Abdelfatah Al-Sisi on Sunday vowed to retribute those behind the terrorist attack that killed 22 border troops.
"Their blood will not go in vain," Al-Sisi said while attending a military funeral for the killed.
The Saturday attack in western Al-Wadi Al-Jadid province near Libya is considered the deadliest strike on security forces since Mohammad Morsi's ouster.
Al-Sisi said that such operations would not undermine his country's will to uproot extremism and terrorism. A three-day mourning period was declared.
Egypt has grown increasingly wary of the unrest in Libya, which has been mired in turmoil since the ouster and killing of Muammar Qaddafi in 2011, with the central government unable to control feuding militias.