Even before Sunday's deadly assault on Egyptian soldiers, there have been repeated attacks by militants in Egypt's Sinai Peninsula in the 18 months since the ouster of longtime President Hosni Mubarak. Some, involving Palestinians, were directed against Israel, and others targeted Egyptian forces in Sinai.
— June 18, 2012: Militants from Sinai open fire on Israeli civilians building a border security fence, and killing one worker. A little-known al-Qaida-inspired group claims responsibility.
— April 5, 2012: A rocket falls in Eilat, Israel's Red Sea resort, located next to Sinai. There are no casualties. Israel says the rocket was launched from Sinai. Egypt denies that.
— Aug. 18, 2011: Gunmen cross into Israel from Sinai and attack vehicles, killing eight Israelis. Israeli forces chase the attackers back into Egypt, mistakenly shooting at Egyptian soldiers, killing six. Gaza militants and their allies in Sinai are believed responsible.
— July 19, 2012: Two gunmen on a motorcycle kill two soldiers in Sheik Zweid, close to Rafah in northern Sinai. The attackers are not identified or arrested.
— June, 2012: Five policemen are killed when militants open fire on a checkpoint in El-Arish in northern Sinai.
— May 8, 2012: A soldier is found shot dead in a suspected revenge attack.
— May 3, 2012: A soldier is killed when gunmen open fire on a Rafah checkpoint close to the Gaza-Sinai border.
—Militants blow up the pipeline that carries natural gas from Egypt to Israel and Jordan 15 times over 18 months.
—There are several kidnappings of foreign tourists. Kidnappers generally demand release of imprisoned relatives. The tourists are freed unharmed.