The group, which has carried out scores of attacks mainly targeting Egyptian security forces since the 2013 military overthrow of an elected Islamist president, posted the claim on a militant website.
In an interview with the private ONTV network yesterday, Egyptian President Abdel-Fattah el-Sissi said the country faces a tough struggle ahead in combatting terrorism and that the "price will be very heavy."
He said there are around 25,000 Egyptian troops are operating in Sinai, which has seen more than a decade of militant violence.
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