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middle of the the largest city in the country. >> i'm looking for the mother ship. >> reporter: these things, about a dozen or so of them, floated high above the manhattan skyline, invisible to faa radar. whatever they were, they provoked intense curiosity, but no panic. the city's help line lit up with calls. of course, twitter was atwitter. and even the national ufo reporting center in seattle got a call. >> they saw one very relatively large object apparently lower in the atmosphere, but what intrigued them was a cluster of such smaller objects apparently higher in the sky. >> reporter: many people scoff at the notion. others are absolutely convinced. the ufo center in seattle says it gets 3,000 to 5,000 reports of ufo sightings every year. >> that evidence strongly suggests that our planet is being visited routinely. >> reporter: maybe, but it turns