PHOENIX -- Maricopa County Sheriff Joe Arpaio is offering a $5,000 reward for information leading to the arrest of those responsible for the racially motivated vandalism of a black family's west Valley home.

Walter and Judith Conley's Litchfield Park home was in its final stages of construction when the couple went to take a look at it Nov. 26. Inside, they found anti-black messages and profanities carved into the walls of almost every room of the $800,000 house. Several of the walls had been smashed in.

A month later, the Maricopa County Sheriff's Office had developed no solid leads, so Arpaio decided to offer an incentive for people with information to come forward.

"Somebody out there knows who did this," Arpaio said in a media release. "Perhaps $5,000 will persuade them to do the right thing."

The Conleys had to pay out-of-pocket for repairs to the home, many of which Walter performed with his own hands. The couple said they're disappointed that a $5,000 reward may be the only way to solve their case.