'Anyone else feel that rumble?' MN mayor, residents take to Facebook for answers


Just what the heck caused that giant rumble around Isanti yesterday?

The city's Mayor George Wimmer took to Facebook and Twitter to see if anyone else felt it. And yes, people did.

Here's the mayor's post:


It got more than 120 comments, with people noting it shook windows in Bethel, rumbled houses and confused dogs.

People were wondering if it was a tree falling, a train, a crash, an explosion of some sort ...

The Isanti County Sheriff's Office jumped in with an answer shortly after, writing on the thread and offering a longer explanation on their own Facebook page.

The culprit?

An explosive device on ATK's testing grounds went off, according to the sheriff's office.

"There are NO emergency situations pertaining to this explosion that was heard," they wrote. "They do test these devices there [at ATK], this time it was an accidential [sic] discharge. No police or EMS were needed."

The grounds are in Anoka County, but just across the border from Isanti, west of St. Francis, the sheriff's office says.

FOX 9 also spoke with ATK about what exactly was being detonated.

So what is ATK?

It's an aerospace and defense technologies company, according to the website. Among the products they build: "tactical missiles, subsystems and defense electronics; and precision weapons, armament systems and ammunition."

The company has three Minnesota locations: Minnetonka, Plymouth and Elk River.

Next Up

Karl-Anthony Towns

Timberwolves' defense fuels win over Pelicans

The Wolves' have bought in on the defensive end as part of a 2-0 start.

Minnesota Wild

Ryan Hartman's OT goal helps Wild stay undefeated

The Wild improved to 4-0 with a win over the Ducks.

Mar'Keise Irving / Gopher Football

Gophers pound Maryland to stay in Big Ten West race

Four different players scored a rushing touchdown in a 34-16 victory over Maryland.

Father Paul Kubista at St. Mary of Czestochowa

Controversy after Delano priest shares vaccine misinformation in church bulletin

Father Paul Kubista is pastor at St. Mary of Czestochowa Catholic Church.


Mel-O-Glaze, DreamHaven Books robbed at gunpoint minutes apart

The businesses were hit by three robbers just six minutes apart on Oct. 21.

Cambridge house explosion

Explosion destroys house in Cambridge, 5 injured

The explosion occurred early Saturday morning on the 33000 block of Hillary Circle.


Charges: Lyft driver sexually assaulted woman in her home

The defendant is being held on a $100,000 bond.

Pixabay - black bear

Black bear bites professional baseball player in western Wisconsin

The former MSU-Mankato star was bitten in his back.

mickey moore driver's license shared

Beleaguered Ward 9 city council candidate loses Strib endorsement

Mickey Moore has faced questions in recent days about where he actually lives.