A Kentucky sheriff has been arrested after fatally shooting a judge in his chambers, police say.

District Judge Kevin Mullins died at the scene after being shot multiple times in the Letcher County Courthouse, Kentucky State Police said.

Letcher County Sheriff Shawn Stines, 43, has been charged with one count of first-degree murder.

The shooting happened on Thursday after an argument inside the court, police said, but they have not yet revealed a motive.

Officials said Mullins, 54, was shot multiple times at around 14:00 local time on Thursday at the court in Whitesburg, Kentucky, a small rural town about 150 miles (240km) south-east of Lexington.

Sheriff Stines was arrested at the scene without incident, Kentucky State Police said. They did not reveal the nature of the argument before the shooting.

According to local newspaper the Mountain Eagle, Sheriff Stines walked into the judge's outer office and told court employees that he needed to speak alone with Mullins.

The two entered the judge's chambers, closing the door behind them. Those outside heard gun shots, the newspaper reported.

Sheriff Stines reportedly walked out with his hands up and surrendered to police. He was handcuffed in the courthouse foyer.

The state attorney general, Russell Coleman, said in a post on X, formerly Twitter, that his office “will fully investigate and pursue justice”.

Kentucky State Police spokesman Matt Gayheart told a news conference that the town was shocked by the incident

“This community is small in nature, and we’re all shook,” he said.

Mr Gayheart said that 50 employees were inside the court building when the shooting occurred.

No-one else was hurt. A school in the area was briefly placed on lockdown.

Kentucky Supreme Court Chief Justice Laurance B VanMeter said he was "shocked by this act of violence".

Announcing Judge Mullins’ death on social media, Kentucky Governor Andy Beshear said: “There is far too much violence in this world, and I pray there is a path to a better tomorrow.”