SA home set on fire twice in one night

A house in South Australia's southeast has been set on fire twice in one evening in what police say was a targeted attack.

A fire was lit at the front door of a home in Millicent on Saturday afternoon.

Later that night a blind was set on fire at the same house.

Police believe the fires are linked to another two arson attacks at different Millicent homes earlier this month.

"It's a significant concern that this behaviour is happening," Millicent Senior Sergeant Peter Brown said on Monday.

Mr Brown said police have identified a person of interest.

"It's not a random incident," he said.

"The victims and the person of interest are known to each other."

There was only minor damage to the home and no injuries.