"I saw a policeman with a rifle pointing at one of the guys."
The road had been closed off from Captain Scott Rd, up to Glenview Rd, he said.
A police helicopter was also flying over the area.
The onlooker said traffic was being diverted away from the area.
Nobody looked hurt, he said.
Police said the man with Lolesio was detained while his identity was being confirmed. This man was assisting police with inquiries and would be released without charge, the spokeswoman said.