Egypt ? Two suicide bombers tried to attack international peacekeepers and police in the Sinai Peninsula on Wednesday, blowing themselves up just two days after nearly simultaneous bombings killed at least 21 people at the Sinai beach resort of Dahab.

Eager to avoid damage to Sinai’s vital tourist trade by linking al-Qaida to the bombings, Egyptian authorities have blamed Bedouin tribesmen for the attacks. But some outside intelligence officials say groups linked to Osama bin Laden’s terror network are the more likely suspects.

Multinational Force and Observer peacekeepers, who are helping to monitor the 1979 Egypt-Israeli peace deal, have been struck twice in less than a year – both times after larger and bloodier attacks on Sinai resorts.

Wednesday’s attacks, near the main peacekeeper base about three miles south of the Rafah border crossing to the Gaza Strip, were unsophisticated. One bomber was riding a bicycle and only the militants died.