Reuters: Australian police treated the country’s entire bushfire disaster zone as a crime scene on Tuesday as investigators combed through a blackened wasteland to find clues to the culprits behind the country’s deadliest fires. Arson investigators began their work even as about 25 fires still raged across southern Victoria, including some of the hardest-hit areas north of Melbourne where so far 173 people have been confirmed dead, many burnt in cars and their own homes. “All of the …