Egyptian security officials say a police driver kidnapped this week has been publicly shot dead in Sinai by suspected militants from the local Islamic State affiliate.

They say three militants and the policeman arrived Thursday at el-Arish's residential al-Masaeed district in a green pickup truck.

The policeman, blindfolded with his arms and legs tied by a robe, was then brought out and shot twice in the head.

The policeman was kidnapped by militants Tuesday while driving a police car in el-Arish. The militants took away the vehicle too.

The officials spoke on condition of anonymity because they were not authorized to speak to the media.

Militants have been fighting security forces in Sinai for years, but the insurgency grew deadlier and broader after an Islamist president was ousted in 2013.