United Parcel Service posted quarterly profit marginally below estimates on Tuesday and again declined to issue annual revenue and margin forecasts, deepening concerns that changing U.S. trade policy is weighing on the delivery giant.

United Parcel Service on Tuesday reported better second-quarter revenue than analysts had expected, but its profit fell short and the shipping giant didn't provide a new full-year outlook.

UPS saw its second quarter revenue and profit decline compared with a year ago as it faces trade volatility and decreased U.S. shipping volumes.