The US military says sensors from the first suspected Chinese spy balloon dropped on the US have been recovered from the Atlantic Ocean.
US Northern Command said search crews “found significant debris at the site, including all priority sensor and electronics pieces”.
The FBI is examining the items, which the US says were used to spy on sensitive military sites.
The US has shot down three more objects since the first on February 4.
Military officials say “large pieces of structure” were also recovered off the coast of South Carolina on Monday.
According to JEE News, about 30-40 feet (9-12 m) of the balloon’s antenna was among the items found.
US officials said the high-altitude balloon originated in China and was used for surveillance, but China said it was simply a weather monitoring aircraft that had gone astray.
Since that first incident, US fighter jets have shot down three more high-altitude objects in as many days – in Alaska, Canada’s Yukon Territory and over Lake Huron on the US-Canada border.
In the Lake Huron attack, the first Sidewinder missile fired by a US F-16 fighter jet missed its target and exploded at an unknown location, US media reported, citing military sources. According to reports, the second missile hit the target.
Each Sidewinder missile costs more than $400,000 (£330,000).
Officials have said the slow-moving unidentified objects, all of which are smaller than the first balloon, could be difficult for military pilots to target.
Three other objects were shot down “out of an abundance of caution,” White House spokesman John Kirby said Monday.
He said there was “no direct threat to people on the ground”, but had been destroyed “to protect our security, our interests and the safety of flight”.
Officials described the balloon that was shot down over South Carolina as the size of three buses.
The second object, on Alaska, was described by authorities as the size of a “small car”. The third object, over the Yukon, was “cylindrical.” And the fourth, above the Michigan, is said to be “octagonal” with strings attached.
A Pentagon memo later reported in the US media stated that the flying object that crashed over the Yukon was “a small, metallic balloon with a payload tethered to the bottom”.
Defense officials also wrote in the memo that the object that fell in Michigan “subsequently slowly” descended into the water after impact.
