KANSAS CITY, MO (KCTV/AP) -- Authorities have apprehended a fired worker who is accused of threatening a shooting in Kansas City's massive subterranean network of businesses housed in old limestone mines.

Police said just before noon Tuesday that they found the worker at another location and lifted the lockdown at Hunt Midwest SubTropolis. No other details were immediately released about the capture, including the worker's name.

Police said earlier that security spotted the worker entering the cave system at 8600 NE Underground Dr. after he said he would, "shoot the place up."

Numerous federal, state and local agencies helped search while workers were told to stay inside their locked offices.

Many of the businesses in the cave system specialize in storage or warehousing because they are protected from extreme weather and boast stable, year-round temperatures and humidity.

Bogdan Wos has owned and operated KC Envelope inside of the caves for 40 years, but not a single day has been like this one.

“First shift there are about 30 people working here, so it was concerning,” Wos said.

Wos’s first concern after hearing about a possible shooter inside the business complex was for his employees. He did as police instructed.

“Just a lock right here,” Wos said.

Making sure no one could get in. The caves pose a unique challenge. Investigators had to search more than six million square feet.

“A challenge like this on such a large scale, we require the assistance of other law enforcement agencies,” Captain Tim Hernandez, KCPD, said.

Officers did find a backdoor of Wos’ business unlocked.

“They were here. They blocked that intersection right here and there were like six, five or six officers right here,” Wos said. “A little strange. It has never happened before, but I knew what was going on, so it didn’t surprise me.”

Not a single threat like this in the 40 years Wos has made envelopes here in Kansas City.

“They did what they had to do,” Wos said.

To keep people inside the complex safe and get work back to normal.

So far, police have not shared more information on the man they arrested.

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