Egyptian army soldiers stand guard on the border with Egypt in Rafah, southern Gaza Strip, on July 5, 2013. Egyptian official said the country&#39;s border crossing with Gaza Strip in northern Sinai has been closed indefinitely, citing security concerns. The decision comes hours after suspected Islamic militants attacked four sites in northern Sinai and Egyptian soldier was killed early today, targeting two military checkpoints, a police station and el-Arish airport, where military aircraft are stationed. Photo by Ahmed Deeb /  WN