Four Black Hawk military helicopters buzzed over Downtown Pittsburgh and the city’s North Side in broad daylight for more than 30 minutes Thursday afternoon. And nobody seemed to know why.

Pittsburgh Mayor Corey O’Connor’s spokeswoman didn’t know about it. Allegheny County’s spokeswoman wasn’t sure, either.

City and Allegheny County Police denied any involvement.

“We do not own or operate any military-style helicopters so I can confidently say that is not us,” county police spokesman Jim Madalinsky told TribLive.

“Pittsburgh Public Safety is not involved whatsoever,” added Pittsburgh police spokeswoman Emily Bourne. “It has nothing to do with the city. It has nothing to do with the (2026 NFL) Draft — as far as we know.”

“This is the first I’m hearing about it,” said Greg Leathers, who heads Region 13’s Southwestern Pennsylvania Counterterrorism Task Force.

As Pittsburgh redds up to host an anticipated 700,000 football fans at this month’s draft — and just a day before the Pittsburgh Pirates play their season home opener at PNC Park — the list of those who didn’t know why choppers hovered above Pennsylvania’s second-largest city formed a veritable who’s who of public safety in the Pittsburgh area.

Turns out it was the Pennsylvania Army National Guard all along.

“Yes, it was us,” spokeswoman Angela Watson said with a laugh. “It’s a normal training route … Why nobody could tell you definitively what it was? That’s strange.”

Watson said the Guard flew its dark UH60 Black Hawks around Pittsburgh International Airport then followed the Ohio River toward the confluence and Downtown Pittsburgh. From there, the unit, which is based in Johnstown, took a hard turn and headed north.

The Guard is set to fly the helicopters over the Pirates’ game Friday afternoon as Maj. Gen. John R. Pippy stands on the ballpark diamond. She added they routinely notify air-traffic officials about their training plans, which ramp up in April and wane in August.

A Pittsburgh International Airport spokesman was unable to confirm those details Thursday. The Federal Aviation Administration did not return phone calls or an email seeking comment.

Social media — surprisingly — was almost entirely silent Thursday on the topic. Only NAN Media, a social-media feed posted to Facebook and Instagram by lifelong North Sider Jacob Dumont, snagged clips of the helicopters zipping around the city.

“We were actually just doing some gardening, getting the mulch out — we look up and it’s THUP, THUP, THUP, the roar of engines,” Dumont, 34, of the city’s Marshall-Shadeland neighborhood, said.

Dumont grabbed his iPhone and clicked record. He then developed his own theories — and the one about Friday’s ball game turned out to be right.

“We’re gearing up for this draft and somebody else mentioned the (Pirates’) home-opener,” he said. “It’s got to be one or the other.”