Sydney  - Six Australian graffiti artists caught defacing trains in London had been on a global graffiti spree that had taken them to Japan, Germany, Spain and Italy, news reports said Thursday.

The Sydney men, known as the AMF Crew, were jailed for vandalism, Australia's Daily Telegraph reported from London.

British authorities said they had recorded their crimes in more than 1,000 photos.

"It became clear that these men were part of a highly organized international gang linked to acts of vandalism worldwide," British Transport Police Chief Superintendent Mark Newtown said.