Egyptian soldiers killed at least three supporters of Mohamed Morsi in Cairo hours after Islamists attacked sites in the Sinai.
The Morsi supporters were shot while trying to breach the Cairo barracks where the deposed Egyptian president is being held by the army.
Supporters in cities across Egypt on Friday protested Wednesday’s coup, which removed Morsi from power a little more than a year after his election as president.
Earlier in the day, 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.