Developing:
Missing Air Algerie flight has crashed, says Algerian aviation official

This combination of undated file photos provided to the Associated Press shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lingzi Lu, a Boston University graduate student. Richard, Campbell and Lu were killed in the explosions at the finish line of the Boston Marathon Monday, April 15, 2013, in Boston. (AP Photo/File)

Associated Press
This combination of undated file photos provided to the Associated Press shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lingzi Lu, a Boston University graduate student. Richard, Campbell and Lu were killed in the explosions at the finish line of the Boston Marathon Monday, April 15, 2013, in Boston. (AP Photo/File)
This combination of undated file photos provided to the Associated Press shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lingzi Lu, a Boston University graduate student. Richard, Campbell and Lu were killed in the explosions at the finish line of the Boston Marathon Monday, April 15, 2013, in Boston. (AP Photo/File)
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