A man has been arrested after spending more than six hours on top of a crane at an inner Brisbane construction site.

Police have blocked off Carl Street in Woolloongabba and had been negotiating with the man since being alerted to the situation about 4.30am.

UPDATE: After more than 6 hours, crane climber has been arrested @7NewsQueensland pic.twitter.com/dV7VDqtO47 — Sarah Greenhalgh (@GreenhalghSarah) December 6, 2015

He had earlier been involved in a tense escape plot as he tried to scale down a cable and away from emergency services who had been sent up the crane to rescue him.

Frightening scenes in Woolloongabba as man scales down cable away from rescuers #7News pic.twitter.com/c23GvclbhE — 7 News Queensland (@7NewsQueensland) December 6, 2015

PIC: Man is continuing to dangle from crane.. Appears to be climbing back up & yelling at rescuers @7NewsQueensland pic.twitter.com/nCqhTkAuw8 — Sarah Greenhalgh (@GreenhalghSarah) December 6, 2015

A police spokesman said the man's motive was still unclear and he was "not making a lot of sense".

View photos

The man dangles precariously above a Brisbane construction site. Photo: YouTube/Pixie Jenkins

View photos

The man is seen hanging only with one arm on the crane. Photo: YouTube/Pixie Jenkins

MORE TO COME...

Morning news break - December 6