US authorities have said they believe multiple people were involved in an attack in New Orleans that killed 15 and wounded dozens on New Year’s Day.

The driver of a pick-up truck that sped into large crowds in the city’s French Quarter has been identified as Shamsud-Din Jabbar, a US Army veteran from Texas, who was later killed in a shootout with police.

CCTV footage shows people running to escape as the attack took place.