PEOPLE'S Power Movement leader Noel Anjo has given news agency AAP a first-hand account of the circumstances around police opening fire on university students last Wednesday.
Describing the shooting as “an ambush”, Mr Anjo, said “they were assaulting and firing at them."
Mr Anjo, who was a member of the student organisers, rejected reports that students were preparing to march on parliament.
He said they were about to board buses which would take them to parliament to present a petition.
"There was no march," he said Mr Anjo. "There were flags and maybe one or two banners, and the students were in the bus.
"The police ordered them to move out of the bus, pulled them down and then they said `you're not going to Parliament' and then it was like ambush," Mr Ambo told AAP.
There is still no reliable and independent information on casualties from the shooting. The PNG government says there were no deaths but other sources report that one student died and at least 20 were wounded, some seriously, when police using high powered weapons fired indiscriminately into a group of unarmed students.
Johnny Blades of Radio New Zealand International reports that around 40 people, mostly students, were reported to have been hospitalised with injuries, including four who are in a critical but stable condition.
In a stunning revelation which indicates a total breakdown of police discipline, two of those hospitalised appear to have been chased and shot by police several kilometres from the campus.
Mr Anjo told AAP “the police started everything:.
"We're mourning, we're mourning for our country because our country is sinking," he added.
"We are fed up with the government, we are fed up with the police."
The PNG government has blamed Wednesday's violence on student "thuggery".
While the situation in Port Moresby is now described as stable, political unrest is sweeping the Highlands and Mr O'Neill faces continuing calls to resign as prime minister.
He's refusing to do this, describing the corruption allegations as being "of questionable political intent".