NEW ORLEANS (AP) — Gunmen opened fire on people marching in a neighborhood Mother’s Day parade in New Orleans on Sunday, wounding at least 19.

The shooting — described by the F.B.I. as a flare-up of street violence — shattered the festive mood surrounding the parade, which drew hundreds of people to the Seventh Ward, not far from the French Quarter. Video taken in the aftermath showed victims lying on the ground, blood on the pavement and people comforting the wounded.

At least three of the victims were seriously wounded. Of the rest, many were grazed and the authorities said that over all, most of the wounds were not life-threatening. No deaths were reported.