Dozens of bullets can be heard in just 30 seconds in a shocking video of the carnage in Dayton, Ohio, that left 10 dead early Sunday.

Stunned onlooker Izack Johnson started filming from his car as he heard gunshots in the city’s entertainment district at around 1:30 a.m.

In the first 30-seconds of his clip, more than 40 gunshots can be heard ringing out — some presumably being the hero cops who eventually “neutralized” the so-far unidentified madman after he killed 9 innocent people.

People are seen racing away from the carnage as Johnson swears in shock at what he is witnessing.

“Oh f—k. Dude what the f—k!” he says in the video, with the gunshots ending 15-seconds before his video finishes, presumably after the gunman was himself killed.

“At a loss for words and full of emotions, this isn’t a city I grew up in,” Johnson wrote on Twitter.

“Prayers for everyone hurt, and bless everyone who was able to walk away. I’m thankful for you.”

Mayor Nan Whaley said that the unnamed gunman was wearing body armour and used an “AK-like gun assault rifle” with “high capacity magazines” when he opened fire in the popular nightlife district.

“In less than one minute, Dayton first responders neutralized the shooter,” Whaley said, saying they saved “hundreds” of lives by killing the gunman so quickly.

As well as the nine fatalities, hospitals treated 27 people who were wounded in the shooting, the mayor said at a press conference.