According to the East New Britain police commander Anthony Wagambie junior, the three had gone there to have their lunch on Saturday when they were set upon by two robbers.
Police report that the two attackers were armed with bush knives.
When one of the victims tried to retaliate, he was slashed on his right cheek by one criminal.
Guards at the nearby hotel were alerted and police were notified and searched the area on foot but the suspects had already got away.
Police are investigating and expect to make some arrests soon,