But he said the bombing had caused law-enforcement officials to take greater precautions.
The bombing caused 20,298 civil victims over nine air raids.
The bombings caused three deaths and injured more than two dozen people.
The bombings have caused only minor damage and no injuries.
The bombing caused $10 million in property and stock damage.
The bombing destroyed much of the city and caused further problems for the German supply line.
But stealing was one thing, mass murder, which the bombing had caused, was quite another.
The bombing did not cause much damage and most of the casualties suffered were civilian.
Their bombings caused a lot of material damage, but no deaths resulted.
At the same time, such bombing would cause civilian casualties and increase the danger to the hostages, American officials say.