The US State Department condemned the deadly shelling of a convoy in eastern Ukraine on Monday that killed dozens of people, but said it could not confirm who was responsible for the attack."We strongly condemn the shelling and rocketing of a convoy that was bearing internally displaced persons in Luhansk and express our condolences to the families of the victims," State Department spokeswoman Marie Harf told a news briefing. "Sadly, they were trying to get away from the fighting and instead became victims of it."The Ukrainian government accused pro-Russian rebels of targeting the convoy, which it said was bearing white flags. The separatists denied responsibility.