Matthew 24:6-7
And you will hear of wars [going on] and rumors of [other] wars [pending]. Do not worry, for such things must necessarily happen. But the end has not yet come. [Note: By "the end" here Jesus probably alludes to the downfall of Jerusalem, in AD 70, with its attending destruction of the Temple buildings].
Luke 21:25
"Then [Note: This event answers to the "immediately" of Matt. 24:29, and suggests the next major event on God's calendar] there will be [supernatural] signs [evident] in the sun and moon and stars. And on earth [there will be] distress among nations; they will be perplexed by the roaring of the ocean's churning waves. [Note: Probably this is figurative language for highly agitated conditions on earth].