Doug B
Footballguy
Another article with some more details (ABC News, 2/7/2023):
Officials have said the debris field is approximately the size of 15 football fields by 15 football fields [a square-mile-ish - db] and that the balloon had propellers and a rudder.
...
The Pentagon has said FBI experts were aboard recovery vessels and a senior government official has said pieces would be brought to the FBI lab in Quantico, Virginia, for analysis.
...
Another official confirmed that the balloon was equipped with self-destruct explosives [!!! - db], but so far, no explosives have been found.
The same official confirms that U.S. U2 spy lines [sic -- I think this is supposed to be 'spy planes' - db] were used to photograph the payload area carrying the sensor equipment, adding that allowing the balloon to fly over the U.S. provided valuable information about how they operate.
I had previously read about the use of U2 planes to photograph the balloon's payload over the US Midwest ... but it was on only semi-reputable websites. This time it's ABC News running with it.