New Orleans police said nobody has been arrested after a shooting during a Mother's Day parade that left at least 12 injured, according to the Associated Press.
The incident happened at about 2pm local time (8pm BST) with 200 people at the event when gunfire erupted.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.