* Bank Julius Baer says it has launched internal investigation
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* Attorney general does not rule out questioning Blatter (Adds details, Julius Baer probe)
By Karolin Schaps and Mark Hosenball
BERNE, June 17 (Reuters) - Swiss prosecutors investigating corruption at global soccer body FIFA have identified 53 suspicious bank transactions, the attorney general said on Wednesday, stressing that a complex investigation may take a long time to unfold.