On Wednesday, the Teamsters Union said United Parcel Service (UPS) "walked away" from negotiations over a new contract, a claim the shipping giant denied, lobbing its own accusation that the union had stopped negotiating.
The two sides traded salvos in early morning statements as they attempt to come to an agreement to prevent a strike when the current contract, which covers some 340,000 workers, expires at the end of the month.
Shares of the parcel delivery company were down 2.3 percent in morning trading.
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