EL-ARISH - Helicopters carried out missile strikes against Islamic militants in Egypt‘s first airstrikes in the Sinai Peninsula since 1973, as the military said Wednesday it was launching an offensive to „restore control“ over the territory following the bloodiest ever militant attacks on the army.

The use of air power marked a sharp escalation in Egypt‘s fight against Islamic militants who have become increasingly active in the mountainous, desert peninsula bordering Israel and Gaza. Earlier this week, militants stunned the Egyptian army with a bold, surprise attack in which gunmen killed 16 soldiers, stole armoured vehicles and drove into Israel to attempt another attack. In a statement read out on state TV, the military said it has started a joint military-police ground operation in Sinai, backed by warplanes, to „restore stability and regain control“ of the Sinai. It provided little detail.

"The Armed Forces and the Interior Ministry, backed by warplanes, started on Tuesday night implementing a plan to restore stability and security control and to pursue and target the terrorist and armed elements in Sinai,“ it said.

It said initial operations had been successful and that the campaign was continuing. „We call on the tribes and residents of Sinai to cooperate to regain security control“ of Sinai, the statement said. The Sunday ambush was one of the bloodiest attacks in Sinai in years and the deadliest against Egyptian troops, underlining the growing lawlessness of the territory, where security forces repeatedly have been targeted by militants, some loosely linked with al-Qaida.

In the latest violence, gunmen opened fire late Tuesday night on three security checkpoints around el-Arish, the capital of North Sinai province, some 50 kilometres (31 miles) from the borders with Gaza and Israel. One of the attacks was on the checkpoint on the main highway between el-Arish and the town of Rafah on the Israeli border.

The shootings wounded six people, among them a military officer, two soldiers, two policemen and a civilian whose condition is critical, security officials told The Associated Press. The officials spoke on condition of anonymity because they were not authorized to talk to the press.

Helicopters carried out strikes using missiles in retaliation later, security officials said. They did not give further detail.

Bedouin resident Abdel Rahman Abol Malkhous says he saw attack helicopters overhead firing missiles about 30 kilometres (18 1/2 miles) east of El-Arish in the area known as Sheikh Zuwayed near the Rafah border crossing with Gaza.

The security officials said it was the first time the army has fired missiles in Sinai since Egypt‘s 1973 war with Israel, in which Egypt tried to recapture the then-Israeli held peninsula.

Sinai reverted to Egyptian control under Cairo‘s 1979 peace treaty with Egypt. Israeli forces completed the withdrawal from the peninsula in 1982. In the Sunday attack, Egypt‘s military said 35 militants were involved, opening fire with assault rifles and rocket propelled grenades on soldiers at a border checkpoint as they broke their daily fast for the holy month of Ramadan with a sunset meal.