One policeman was killed and at least 29 others were wounded Wednesday when an unknown attacker hurled a high-powered bomb, or possibly rocket-propelled grenades, at a police station north of Cairo and near El Arish.
Shortly before, the Egyptian military called on people to rally on Friday against violence, in effect a call for a demonstration against the Muslim Brotherhood and its ousted president Mohammed Morsi.
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Two pro-Morsi activists were killed earlier on Wednesday during a march.
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