UPDATE 9:23 a.m. Wednesday, July 24, 2019 - Deputies said the incident started as a felony warrant at an apartment on the 400 block of Nelson Avenue. However, they found a pill presser, a powdery substance and what looked like counterfeit pills, they said. 

All personnel on the scene left the apartment as a precaution until they knew what they were dealing with. 

"It is just confined to one room and nobody in the area is in any immediate danger," said Megan Mcmann with the Butte County Sheriff's Office. "We have seen more cases recently involving Fentanyl, we have seen a couple of cases recently where we have seen it pressed into counterfeit pills." 

The sheriff's office has not confirmed whether an arrest was made. 

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BUTTE COUNTY, Calif. - The Butte County Sheriff's Office is investigating possible illegal drug activity at a location in Oroville. 

According to the sheriff's office, an arrest warrant was served around 10:08 a.m. on the 400 block of Nelson Avenue in Oroville. 

Deputies are in the process of securing the scene. 

Authorities said there is a possibility that there may be fentanyl at the location but they are still investigating. 

Stay with Action News Now for the latest updates as they become available.