Military officers walk at a scene where a bomb exploded on July 23, 2014 in Kaduna, north of Nigeria. A second blast today in the city has killed at least 17 people, the national rescue agency said, after an earlier suicide attack in the city killed at least 25. An around-the-clock curfew was announced for the city after the bombings. AFP PHOTO / STRINGER (Photo credit should read -/AFP/Getty Images)
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