(JTA) — Islamists attacked Egyptian military posts in the Sinai, killing at least one on the Gaza border.

The attack on the police post at Rafah, a city on the Gaza-Egypt border with a Palestinian side and an Egyptian side, was one of several attacks Friday by Islamists on Egyptian security forces. Two other men were wounded in the Rafah attack.

Assailants also fired fired rocket-propelled grenades at army checkpoints at the El-Arish airport in the Sinai.

The attacks came as Egypt was bracing for mass protests Friday by supporters of Mohamed Morsi, the Egyptian president who was deposed Wednesday by the army after a year in power. Morsi, who hails from the Muslim Brotherhood, called the action a coup.