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North Korea has floated another 600 trash-filled balloons across the border, the South's military said Sunday, with personnel in hazmat suits seen collecting piles of rubbish containing everything from cigarette butts to bits of cardboard and plastic.

The U.S. is tracking a suspected Chinese surveillance balloon that has been spotted over U.S. airspace for a couple days, but the Pentagon decided not to shoot it down over concerns of hurting people on the ground, officials said Thursday. The discovery of the balloon puts a further strain on U.S.-China relations at a time of heightened tensions.