Military tracking high-altitude balloon over western US

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Chinese spy balloon did not collect, transmit data as it transited US

Information captured by the spy balloon is not believed to have been successfully sent back to Beijing

The U.S. military is tracking a high-altitude balloon over the Western United States, two U.S. officials confirmed to Fox News on Friday. 

It was spotted by U.S. military aircraft and determined to not be a threat. 

The origin of this balloon and its purpose are not yet known, the two officials said.

The balloon is drifting east in the jet stream. 

This is a developing story.