“There were less than we expected,” Mr Dawson said.
He said police knew there was “lots of friction” between the criminal gangs, and were keeping a close watch on the groups.
“We know there is dissent, and we know there is fracturing,” he said about the outlaw bikie gangs.
“When you have got people involved in criminal activity they don’t always get along with each other.”
Mr Dawson was interested in interrupting and disrupting the gangs and said police would keep up the pressure on them.
“Let’s not forget a man was shot dead in a public place,” Mr Dawson said.
A big police team is working through information about the shooting of Mr Martin.
Police are investigating the circumstances surrounding his killing at Perth Motorplex on December 12 amid suspicions the shooter could have been a professional precision sniper.