EL-ARISH, Egypt: Egyptian security officials say four civilians have been killed when a mortar shell hit their tractor in the turbulent northern part of the Sinai Peninsula.

The officials say a fifth civilian was wounded in Tuesday’s attack in El-Arish, Sinai’s largest city on the Mediterranean coast.

Mortar shells fired by militants frequently kill or wound civilians in El-Arish.

Egypt has been battling militants in Sinai for years in an insurgency that intensified after the military’s 2013 ouster of Mohammed Mursi.

The insurgency is led by a local affiliate of the extremist Daesh.

Egypt is also facing a growing number of attacks by militants in its Western Desert.