Border guards killed in sinai
Blast kill four in Egypt's Sinai
More than 10 people were wounded in the attack.
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Egypt tightens Sinai security
Islamist militancy has risen sharply in the lawless region adjoining Israel and the Gaza Strip.
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'Egypt to send aircraft, tanks into Sinai'
Egypt is apparently preparing to use an aircraft and tanks in Sinai for the first time since 1973.
