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Flag of Egypt iStock

Egyptian authorities on Tuesday executed 15 prisoners convicted of attacks on security forces in the Sinai Peninsula, police officials said, according to AFP.

The men were hanged in two jails where they had been held since military courts sentenced them for the attacks in the Sinai, the officials said.

It was the largest mass execution carried out in Egypt since six convicted jihadists were hanged in 2015, noted AFP.

Egypt's military and security forces have been waging a tough and costly campaign against jihadists in the towns, villages and desert mountains of northern Sinai.

Most of the attacks in the Sinai Peninsula in recent years have been claimed by the Sinai Province, the Egyptian affiliate of the Islamic State (ISIS) which pledged allegiance to the jihadists in 2014.

An attack on a Sufi mosque in the region last month claimed the lives of 305 people.

Tuesday’s hangings came a week after ISIS attacked a helicopter with an anti-tank missile at a North Sinai airport as the country's defense and interior ministers were visiting.

The ministers were unhurt in the attack but an aide to the defense minister was killed along with a pilot.

After the mosque massacre, President Abdel Fattah Al-Sisi instructed his military chief of staff to quell the attacks in three months using "brutal force".