Egyptian security officials say a roadside bomb has killed a conscript and wounded three soldiers when it struck a convoy of Humvees during a manhunt for a prominent militant leader in the restive Sinai Peninsula.

Wednesday's attack in the Khariza area near the town of Qasima was further south than the region where militants from Egypt's Islamic State branch usually operate, and close to the Israeli border.

The officials say the troops were searching for militant leader Mohamed Muheisen. They spoke on condition of anonymity because they weren't authorized to talk to the media.

Egypt has grappled with militant attacks that intensified after the military's ouster of Islamist President Mohammed Morsi in 2013. The country's extremist IS branch has claimed responsibility for most of the attacks.