The unprecedented flood of containerised imports into the Port of Los Angeles in the US is not just causing headaches for importers, according to its executive director.

The ongoing import surge is also hurting exporters because importers are sending empty boxes right back to China to pick up more imports, making none available for US exporters, Gene Seroka said.

"We must get our exporters back in the game," he said on Wednesday during the port's monthly press conference.