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Eleven Egyptian soldiers were killed on Saturday attempting to thwart a "terrorist" attack on the zone abutting the , a hotbed of militant activity, the army said.

It was the heaviest loss the army had suffered in years in its long-running campaign in and around the Sinai against militants loyal to the Islamic State group.

Five soldiers were also wounded in the firefight on the eastern, Sinai bank of the canal, the army said, adding that security forces "are continuing to chase the terrorists and surround them in an isolated area of the Sinai".

Egypt's Sinai Peninsula has been gripped by an armed insurgency for more than a decade, which peaked after the ouster of late Islamist and democratically-elected president Mohammed Morsi in 2013.

In February 2018, the army and police launched a nationwide operation against militants focused on North Sinai.

More than a thousand suspected militants and dozens of security personnel have been killed since the start of operations, according to official figures.

In November, to boost its troop numbers around the border town of Rafah in order to quell IS militants.

In August, the army said 13 militants had been killed and nine of its soldiers were "killed or wounded" during clashed in Sinai, without indicating when the fighting had taken place.

In recent years, pipelines carrying Egyptian oil and gas to neighbouring Israel and Jordan have been the primary focus of insurgent attacks.