"Were Sorcerers, Mediums, and Necromancers really performing magic in the bible?"

Deuteronomy 18:10-11 There shall not be found among you anyone who burns his son or daughter as an offering, anyone who practices divination or tells fortunes or interprets omens, or a sorcerer or a charmer or a medium or a necromancer or one who inquires of the dead.

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Several passages in the bible refer to Sorcerers, Mediums, and Necromancers and the magic they supposedly perform. Were these people actually performing magic? Where did they obtain these abilities? Have we ever observed magic occurring? 

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Referenced Verses:
Deuteronomy 18:10, Deuteronomy 18:11