Sailors assigned to Explosive Ordnance Disposal Group 2 recover a high-altitude surveillance balloon off the coast of Myrtle Beach, South Carolina, on Sunday.
Mandatory Credit:	Petty Officer 1st Class Tyler Thompson/US Navy

Sailors assigned to Explosive Ordnance Disposal Group 2 recover a high-altitude surveillance balloon off the coast of Myrtle Beach, South Carolina, on Sunday.
Mandatory Credit: Petty Officer 1st Class Tyler Thompson/US Navy

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A trio of new intrusions leaves America's leaders grasping for explanations

A deepening national security mystery is threatening a political storm after US fighter jets scrambled three days in a row to shoot down a trio of unidentified aerial objects high over the North American continent.