The Division of Fish and Wildlife said the repairman was working Wednesday in Frank Annacone's Hopatcong basement when he heard a growl behind him and turned around to see the bear, WNYW-TV, New York, reported Thursday.
A Division of Fish and Wildlife crew arrived and tranquilized the bear, which stumbled around the neighborhood before losing consciousness.
Officials said the animal will be relocated.
Annacone said he does not know how the bear got into his basement or how long it had been there, as he had not been down to the basement in a while.
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