UPDATE (WKOW) -- An apartment filled with volatile chemicals forced the evacuation of 25 families Tuesday as investigators try to determine what the substances were being used for.
The Madison Police Department and Madison Fire Department were called to the building on Timber Lake Trail around 10:30 a.m. Tuesday.
Police say the apartment building on Madison's west side was evacuated following complaints about an odor.
Madison Fire Chief Steve Davis said upon entering the apartment, they found numerous chemicals.
"When we first got there, there was enough sophistication that it had all the potential to be something flammable or could be a bomb," Madison Police Chief Mike Koval said during a Tuesday evening news conference.
About 4:30 p.m. the bomb squad responded to assess the situation, Koval said.
"There was a lot of stuff, disheveled, and a lot of chemicals," Koval said.
Koval said they are taking their time to investigate.
"It could be anything from drug distribution, or could it be for bombs, or could it be for something unknown," Koval said.
They currently have a 30-year-old male in custody as a person of interest.
Altogether, 25 households have been evacuated and have been moved off site, Davis said.
"There was such a mix of chemicals and flammable liquids that usually aren't seen together," Davis said.
Officials are receiving assistance from the FBI, state Department of Criminal Investigation and the Bureau of Alcohol, Tobacco, Firearms and Explosives.
For more on this story: http://www.wkow.com/story/37551586/2018/02/20/madison-apartment-building-evacuated-after-odor-complaints