Ten Egyptian soldiers were killed and 35 wounded in a car bomb near the North Sinai city of El-Arish, a security official has said.
The soldiers were travelling in a convoy ahead of the attack.
The attack is one of the deadliest in the Sinai Peninsula since al Qaeda-inspired militants began stepping up assaults following the army's ousting of Islamist President Mohamed Morsi in July.
More top news
This morning the prime minister spelled out her belief that we can thrive outside the single market.
"Important clarity" or the grounds for the "theft of democracy"? The PM's declared aims for negotiations have received a mixed response.
A divided theme across the UK today