Egypt has closed its border crossing with the Gaza Strip in northern Sinai indefinitely, citing security concerns.

The decision comes hours after suspected Islamic militants attacked four sites in northern Sinai, targeting two military checkpoints, a police station and el-Arish airport, where military aircraft are stationed.

The military and security forces responded to the attacks. One soldier was killed and three others were wounded.

General Sami el-Metwali said the Rafah passage was shut down today, and would not comment on when it might be reopened. Some 200 Palestinians were turned back to the Gaza Strip after the order.

The clashes come two days after the military removed president Mohammed Morsi of the Muslim Brotherhood. Some Islamist elements have pledged to fight the military's move.

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