Fleet Financial Group shares, boosted by merger speculation for much of the year, came back to earth Tuesday as talks with a potential partner were said to have broken off.

Shares of the Boston banking company dropped $1.50, to $83.375, as word circulated that PNC Bank Corp. had shelved merger discussions with Fleet over operational issues. Fleet was down nearly $3 early in the day, and PNC shares closed at $59.50, up 43.75 cents.

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