UPDATE AUG. 30: During the course of the investigation, detectives identified 47-year-old Bradley Austin as a suspect in this case.
Austin was located at a residence in the 1800 block of Tourmaline Blue Street, near Rancho and Vegas drives, early Wednesday morning and was taken into custody without incident.
Austin was transported to the Clark County Detention Center where he faces one felony count of making threats or conveying false information concerning acts of terrorism.
LAS VEGAS (KTNV) -- The president of the Las Vegas NAACP says someone is harassing their office, leaving threatening voicemails filled with racial slurs.
On top of threats to the employees, Roxann McCoy says one of the callers said someone needs to pull down the statue of Martin Luther King Jr. in North Las Vegas.
She says they started late last week and aren't getting any easier to deal with.
"He references slavery quite a bit and dragging us like they did slaves from the back of his car."
Employees say they've received about eight calls in total.
At first employees say they thought it was an angry person, but realized the extent of the threats as the calls continued.
McCoy says the calls have included sexual threats, threats of violence and a claim they know her license plate number.
As they have continued, the staff is becoming more concerned and frustrated.
"It's hurt, it's anger, it's surprise, it is fear. It is a multitude of emotions that take place. It just makes you feel like, 'How dare you feel you have the right to intimidate any of us because of the color of your skin."
The NAACP have stepped up security at the offices.
Las Vegas police has its patrol detectives and the counterterrorism unit looking into the calls.