Police and other emergency services were called to an industrial site after an incident involving a concrete pump resulted in multiple injuries this afternoon.
According to The Age, a burst pipe at the CBD worksite located at the intersection of Southbank Boulevard and City Road in Southbank.
The incident involved a cement truck dislodging while pouring cement resulting in injuries to four people around 12.50pm.
Construction workers standing nearby were reportedly sprayed with "concrete bullets."
Victoria Police spokeswoman Sergeant Anita Brens confirmed four men were injured, two of whom were in serious but stable condition and were transported to hospital for treatment.
A vehicle traveling past the worksite was also hit by the cement but the occupants were not physically injured.
One witness, who did not want to be identified, told reporters they were blown more than 15 meters by the force of the explosion.
"Blown up the two blokes across the road," he said. "They were going into shock."
The matter will be investigated by WorkSafe.