Aussies told to behave in PNG

Australians working in Papua New Guinea need to respect the country's laws, Immigration Minister Peter Dutton says.

The warning has come in the wake of a serious drink-driving car crash on Manus Island involving two Australian detention centre guards, who have been medically evacuated to Queensland after their vehicle hit a bridge.

"The law applies equally to all people in PNG," Mr Dutton told reporters in Brisbane, saying PNG police were investigating the crash.