CLARKSVILLE — Police arrested four people Tuesday believed to be involved in a drug operation run out of Courtyard Square Apartments in Clarksville.

Anthony Yarbough, 58, Carol Butler, 39, Melissa Ashby, 31, and Tavares Mosley, 29, were arrested on a variety of charges ranging from conspiracy to deal heroin, visiting a common nuisance, possession of heroin, dealing a scheduled substance and possession of drugs.

Clarksville Police Department Detective Nathan Walls said police had been investigating the suspects and that police had Yarbough’s apartment under surveillance for some time. He said police saw a significant amount of traffic in and out of the residence and suspected that they were dealing drugs.

“We’ve known for a long time they were up to no good,” Walls said.

According to Clarksville police, a sting was set up and they purchased two packages of heroin from the suspects, which were valued between $30 and $40 for each package. After the drugs were purchased, the four suspects left the residence.

Clarksville police followed the suspects, who were in two separate vehicles, and they were pulled over on Lewis and Clark Parkway. When police searched the suspects’ vehicles they found “another significant amount of heroin,” Walls said.

He said they discovered about 2 grams of heroin which they valued between $400 and $500.

In addition to the heroin, police allegedly discovered pain pills and Xanax with a street value of about $300 in the vehicles.

All four individuals were arrested.

Mosley was arrested on conspiracy to deal heroin, a class A felony, which is punishable by 20 to 50 years in prison and up to $10,000 in fines.

Yarbough was arrested for dealing heroin, a class A felony, possession of a controlled substance, a class D felony, and maintaining a common nuisance, also a class D felony. He faces 20 to 50 years in prison and up to $10,000 in fines for the class A felony and each class D felony carries a penalty of six months to three years in prison and fines of up to $10,000.

Butler was arrested for possession of heroin, a class B felony and visiting a common nuisance, a class B misdemeanor. Her charges carry penalties of six to 20 years in prison and $10,000 in fines and 180 days in prison and up to $1,000, respectively.

Ashby was arrested on charges of visiting a common nuisance, a class B misdemeanor, which carries a penalty of 180 days in prison and up to $1,000 in fines.