The objects shot down over North America over the past several days were unmanned and did not appear to send communication signals, the United States has said, as questions persist about the nature and the origin of the aircraft.White House national security spokesperson John Kirby told reporters on Monday that while Washington has no “specific reason” to suspect that the objects were conducting surveillance, it is not able to rule out the possibility.“We assessed whether they posed any kinetic threat to people on the ground; they did not,” Kirby said.
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