Capping Off Live Wires

I live in an older house and the range hood over the stove came loose and fell off the wall last night. The wires are now exposed and I don't know what to do with them. There are three wires. I can post a pic if needed. Also when I cap them off should the shut down the main power to the house? I've never done this kind of thing before.
      


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Some details



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