"I'm not necessarily saying it's going to be nuclear," he said during his news-and-talk television show "The 700 Club" on the Christian Broadcasting Network.
"The Lord didn't say nuclear. But I do believe it will be something like that."
Robertson said God told him about the impending tragedy during a recent prayer retreat.
God also said, he claims, that major cities and possibly millions of people will be affected by the attack, which should take place sometime after September.
..."I have a relatively good track record," he said. "Sometimes I miss."
In May, Robertson said God told him that storms and possibly a tsunami were to crash into America's coastline in 2006.
Even though the U.S. was not hit with a tsunami, Robertson on Tuesday cited last spring's heavy rains and flooding in New England as partly fulfilling the prediction.
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