A man brandishing a knife at one of Brisbane's busiest tunnels has disrupted peak-hour traffic as police negotiators try to talk him down.
Officers were called to the entrance of the Clem Jones Tunnel at Shafston Avenue just before 7am on Thursday after a man climbed onto a structure at the northbound entrance.
The entrance and exit to the tunnel at Shafston Avenue has since been closed.
Negotiators are talking to the man and traffic is being redirected.
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