The accident happened today, around midday behind Sir Hubert Murray Stadium at Konedobu in Port Moresby.
According to eye witnesses, the dump truck belonging to POM Stones was fully loaded with sand and was travelling downhill from Lawes Road.
The driver sensing mechanical faults started sounding the horn as a warning, alerting the drivers of other vehicles in front of him to give way.
Before crashing into the vehicle which the victims were in, the dump truck, hit two cars- a taxi and another car. Luckily, passengers of the two cars escaped unharmed.