The United States Navy has released the first official images of its effort to recover what Washington says was a Chinese surveillance balloon. While Beijing has said the balloon was an “unmanned civilian airship” that was primarily gathering weather data and had blown off course, Washington denounced its presence in US airspace as an “unacceptable” violation of the country’s sovereignty.

The United States Navy has released the first official images of its effort to recover what Washington says was a Chinese “surveillance balloon”, which was shot down over the Atlantic Ocean after being spotted in US airspace last week.

The photos published on Tuesday showed US Navy members from an explosive ordnance group leaning over a rigid-hull inflatable boat and pulling in broad swathes of the balloon’s white outer fabric and shell structure.

Using underwater drones, warships and inflatable vessels, the Navy is carrying out an extensive operation to gather all the pieces of the device, which spent several days flying over North America last week before being shot down on Saturday off the coast of South Carolina.

The balloon measured approximately 60 metres (200 ft) tall and was carrying a long sensor package underneath, which the head of US Northern Command, General Glen VanHerck, said earlier this week was about the size of a small, regional jet.

While Beijing has said the balloon was an “unmanned civilian airship” that was primarily gathering weather data and had blown off course, Washington denounced its presence in US airspace as an “unacceptable” violation of the country’s sovereignty.

VanHerck said on Monday that the teams involved in the balloon recovery efforts were taking precautions to safeguard against the chance any part of the balloon was rigged with explosives.

The Navy is also using ships to map and scan the sea floor for all remaining parts of the balloon so US analysts can get a full picture of what types of sensors were used and to better understand how the balloon was able to manoeuvre.