At least three people killed and several more injured as severe weather system damages homes and causes power outages.

Punishing tornadoes have battered the US state of Louisiana from north to south, killing at least three people and causing widespread damage on buildings, including houses.

The storms barrelled eastwards on Wednesday after killing a mother and son in the northwestern part of the state a day earlier.

The system spun off a suspected tornado that killed a woman on Wednesday in southeast Louisiana’s St Charles Parish

and another that pummelled parts of New Orleans and neighbouring Jefferson and St Bernard parishes – including areas badly damaged by a tornado in March.

A tornado struck New Iberia, Louisiana, slightly injuring five people and smashing out windows of a multistory building at Iberia Medical Center.

As night drew on, tornado threats eased in Mississippi, although some counties in Florida and Alabama remained under a severe weather threat.