Two suicide bombers have blown themselves up in Egypt's northern Sinai Peninsula and there are reports of a third attack in the country's Nile Delta.

The attacks come two days after terrorists exploded bombs in a Sinai resort town, killing at least 18 people.

Wednesday's attacks in Sinai targeted members of the Multinational Force and Observers as well as an Egyptian police patrol.

Spokesmen for the Observers, who monitor the border between Israel and Egypt, said there were no casualties among the multinational troops.

Details of the third attack, in the Nile Delta, are sketchy, and there are no reports of casualties.

The multinational peacekeepers have been based in northern Sinai since the 1979 peace agreement between Israel and Egypt.

Egyptian police have detained more than 10 suspects after Monday's bombing in Dahab, along the Sinai coast. That bombing was the third in southern Sinai in the last two years. Dahab is a major center for scuba divers and backpackers.