Authorities have identified the Nashville bomber as 63-year-old Anthony Quinn Warner. According to the Tennessee Bureau of Investigation, Warner’s DNA matched human remains found at the site of the explosion, where he died.

“We’ve come to the conclusion that an individual named Anthony Warner is the bomber,” Don Cochran, a U.S. attorney for Tennessee’s Middle District, said during a press conference on Sunday (Dec. 27). “He was present when the bomb went off and then he perished.”

Warner was also matched to the vehicle ID number on the RV that exploded, Cochran said. As reported by REVOLT, the RV was parked downtown on Christmas morning (Dec. 25) and exploded around 6:30 a.m. local time after broadcasting “Downtown” by Petula Clark and an evacuation countdown clock.

Nashville police were informed about the vehicle and immediately evacuated residents near the area. The explosion damaged over 40 buildings and injured at least three people. Warner was the only person killed in the incident.

Investigators say they’re still looking at “any and all possible motives” for Warner’s actions. According to FBI Special Agent Douglas Korneski, there’s no indication that anyone else was involved in the bombing. He also asked for anyone with knowledge or information on Warner to come forward.

“These answers won’t come quickly,” he said during a press conference. “Though we may be able to answer some of those questions … none of those answers will ever be enough for those affected by this event.”

Korneski also confirmed that Warner had not been on law enforcement’s radar prior to the bombing. He declined to say whether or not the explosion was considered an act of domestic terrorism.

CNN spoke with some of Warner’s neighbors, who described him as a “hermit” who “sort of kept to himself.”

His neighbors also confirmed that Warner had owned the RV used in the explosion “for a long time.”