Shortly after six Wednesday morning, the Saskatoon Fire Department received word of a shed fire in the 100 block of Arrand Crescent. Crews found a fence, shed, and a tree ablaze.  It was a case of arson. The fire started at the fence and spread to the tree and shed.  The shed and its contents are completely destroyed.  Damage is estimated to be: $15,000. If you have any information about this fire you are asked to contact Saskatoon Police.