A young man drew a knife during a fight at a skate park on Thursday, police say.
Police said they believe several people filmed the fight, which happened between 5pm and 5.30pm, and are asking people to send them footage and photographs.
"About 5pm, two young men at the barbecue area adjacent to the skate park were approached by two other young men. An altercation followed, and one of the offenders brandished a knife," they said.
One man was described as being of slim build, about 170cm (5'7") tall and with an olive complexion. The other was described as being about 180cm (5'11") tall, of Caucasian appearance and with blond hair.
They left the scene in a white car, possibly a Mitsubishi Lancer.
Police ask anyone who with information that might help them to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website and quote 6926602.