Associated Press Science Writer Seth Borenstein contributed to this report from Washington.

来自华盛顿的联合社科学作者Seth Borenstein对此篇报道作出了贡献。

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Associated Press writer Tim Talley and freelance photographer Nick Oxford contributed to this report.

NPR: 2 Dead When Tornado Hits Oklahoma City Area

Associated Press Writer Jennifer Peltz in New York and Holbrook Mohr in Jackson, Miss.

WSJ: Union: NY mayor threats postmarked Shreveport, La.

Associated Press writer Andrew Dalton and AP video journalist Raquel Maria Dillon contributed to this report.

NPR: Garcetti Holds Slim Lead As LA Picks New Mayor