It was the third holiday this year when guns have been fired into crowds , New Orleans Mayor Mitch Landrieu said . NEW : Both suspects are believed to be involved in gangs , police say . NEW : Police did n't provide further details on First suspect . NEW : second suspect Martin Luther faces Three counts of attempted second -degree murder . NEW : Three of the 20 shooting victims are still in critical condition , police say .
NEW : Both suspects are believed to be involved in gangs , police say . NEW : Police did n't provide further details on First suspect . NEW : second suspect Martin Luther faces Three counts of attempted second -degree murder . NEW : Three of the 20 shooting victims are still in critical condition , police say .