The youth was believed to be with the crowd that converged at the Boroko police station to get information on suspected kidnappers who were nabbed by police yesterday.
Police prevented the angry crowd from accessing the suspects, which led to the looting of shops next to the station.
The police tried to stop the crowd by firing shots, which allegedly resulted in the wounding of the youth.
The youth was rushed by bystanders to the Port Moresby General Hospital.
Tension is still high around the Boroko area.