People from all over Carter County took to social media about a loud boom that shook their homes and workplaces around 10:15 Friday morning.
"The whole building shook," Ardmore resident Jadean Fackrell said.
"I felt the boom and then it just like rolled roared," Lone Grove resident Kathy Howell said.
Joseph Murray with the Sheppard Air Force Base says Lockheed Martin, a security, aerospace and information technology company, was performing sonic boom maneuvers Friday morning, but he says he doesn't know where.
"I was here waiting on a customer and all of a sudden there was a huge, what I thought, was an explosion," Fackrell said.
Fackrell was at work when she heard the boom.
She says everyone inside at the Oklahoma Pecan Company ran outside.
"The building, the windows rattled, it felt like it shook the building, although we are on a concrete foundation," Fackrell said.
According to the Federal Aviation Administration, a sonic boom is a sound associated with shock waves when an object, such as a plane, flies through the air faster than the speed of sound.
University of Delaware Professor David Suisman says he spent several years studying sonic booms and performing tests back in the 60s.
"It is a byproduct of trying to fly really, really, really fast," Suisman said. "Faster than the speed of sound. This grows out of a military technology out of the late 1940s and 50s where military planes were developed to fly as fast as they possibly could."
A public affairs officer with Lockheed Martin tells us they are still determining where the sonic boom tests took place, leaving those around Carter County, like Fackrell who felt it, still wondering.
"No smoke, no fire, no sirens," Fackrell said. "Don't know what it was."