NEW : More than 200 wildfires -- including More than 70 that are not contained -- are raging . A line of wildfires 12,000 acres long threatens the state of New South Wales , Sydney . High winds and temperatures threaten to make Wednesday Wednesday for the blazes . The 11-year-old has been placed under house arrest , charged with two counts of intentionally causing fire and being reckless as to its spread , NSW Police Force said . More than 200 homes in the Blue Mountains region west of Sydney have been destroyed .
NEW : More than 200 wildfires -- including More than 70 that are not contained -- are raging . A line of wildfires 12,000 acres long threatens the state of New South Wales , Sydney . High winds and temperatures threaten to make Wednesday Wednesday for the blazes . More than 200 homes in the Blue Mountains region west of Sydney have been destroyed .