The U.S. military said on Monday it had recovered critical electronics from the suspected Chinese spy balloon downed by a U.S. fighter jet off South Carolina’s coast on Feb. 4, including key sensors presumably used for intelligence gathering.

“Crews have been able to recover significant debris from the site, including all of the priority sensor and electronics pieces identified as well as large sections of the structure,” the U.S. military’s Northern Command said in a statement.

The Chinese balloon, which Beijing denies was a government spy vessel, spent a week flying over the United States and Canada before President Joe Biden ordered it shot down. The episode strained ties between Washington and Beijing, leading America’s top diplomat to postpone a trip to China.

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It also led to the U.S. military scouring the skies for other objects that were not being captured by radar, leading to an unprecedented three shootdowns in the three days between Friday and Sunday.

Read more: Reuters