Deliberate fire ended Tas tree sit: tweet POLICE have reportedly confirmed that a deliberately-lit fire was behind a record-breaking Tasmanian anti-logging activist being forced from the tree that was her home for 15 months. Tree-sitter Miranda Gibson had until Thursday lived on a 60-metre high platform atop a eucalypt in the Tyenna Valley northwest of Hobart since December 2011. The 31-year-old was forced from her perch after 449 days by a nearby bushfire. Tasmania police were unavailable for direct comment, however, ABC Radio Hobart host Damien Brown tweeted late on Monday night that officers had confirmed to him that the fire was deliberate. "@TasmaniaPolice have confirmed fires that forced @observertree1 from her 457 day tree-top protest were deliberately lit," he said. Former Greens leader Bob Brown last week questioned if the fire that put an end to Ms Gibson's protest had been deliberately lit and called for a swift investigation.