“A group of armed terrorists attacked one of the security checkpoints in north Sinai,” the army spokesman said.
“A car bomb attack, the clashes that ensued and a blast targeting one of the vehicles left eight members of the armed forces dead,” he added.
Three jihadists were also killed in the fighting, he said.
“The search operation is ongoing… in the bid to eradicate the remaining jihadists,” he added.
The military did not reveal where exactly in northern Sinai the attack had taken place.
There was no immediate claim of responsibility for the attack.