The Australian Defence Department has rejected allegations that six Australian soldiers beat a civilian Timorese security guard in Dili last Sunday.

A Fretilin party MP reportedly told East Timor's Parliament that the guard was beaten by the soldiers at a government warehouse. The MP also said two other people were assaulted by the Australian troops.

Defence spokesman Brigadier Andrew Nikolic says Australian soldiers did intervene in a fight between two of the men.

"The patrol approached the men to stop them fighting and one of those men started to abuse the ISF [International Security Force] soldiers," he said.

"There was a scuffle between the men trying to get to the ISF soldiers but at no time did the ISF soldiers touch the men or indeed at no stage did they assault anyone, and after the men left the ISF continued on its patrol.

"Now we are obviously extremely disappointed that these allegations have been made. I can tell you the allegations are totally false and misleading and we reject them."