Bullet casings left on the ground Wednesday, following a Tuesday shooting in Shreveport, La. (Henrietta Wildsmith /Shreveport Times/AP) (AP)
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The annual Fourth of July picnic in a Louisiana neighborhood named after Martin Luther King Jr. had been a festive family event until the gunfire rang out.

For 15 minutes, several gunmen fired indiscriminately into the large crowd as men, women and children dove for cover in the grass or scurried into nearby woods in search of safety. Some huddled among the trees until dawn, scared that what sounded like fireworks going off elsewhere in the city might actually be more shooting.