Residents of New Jersey, New York, Pennsylvania and other East Coast states took to social media on Thursday asking, "What on Earth was that noise?"
A series of sonic booms were heard overhead, but officials at the Pentagon, U.S. Northern Command and the Coast Guard could not confirm the boom's origin.
"It was definitely not U.S. Air Force aircraft," an Air Force spokeswoman told Air Force Times.
Sources tell ABC News that the sonic boom was a result of the Navy conducting an F-35 test flight:
But in the matter of public opinion the mystery continues, with many believing that agents Fox Mulder and Dana Scully from the X-Files should get on this mystery ASAP.
Here are some of the best Twitter and Facebook posts below:
The 1960s-era design continues to transform.
Ukrainian President Volodymyr Zelenskyy said Wednesday that the claim reflects Moscow’s desire to find an alternative to missiles.
"We are way off the initial plan," subcommittee chairman Rep. Joe Courtney, D-Conn., said in Thursday's hearing.
A small, yet nimble and heavily used light-attack helicopter that carries small teams of special operators into battle has a problem.
The decision isn't yet final, but may come as soon as Friday.
The U.S. is sending Ukraine another $100 million in military assistance, including heavy artillery and counter-artillery radars, the Biden administration announced Thursday.
Currently the VA inspector general cannot force former employees to detail problems or crimes they saw during their tenure at the department.
An inspector general report recommended updating the DoD's extremism definition, which it has done, as well as creating a system to track extremism reports.
Guard members wait more than seven months on average for advancement.
Hundreds more fighters have emerged from the Mariupol stronghold where they made their last stand and surrendered.
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