PINE BLUFF, Ark. — Authorities are investigating after two inmates died in separate instances at Arkansas prisons.

State prison officials say 30-year-old inmate Cody Brickner was found dead in his cell Saturday at the maximum-security Tucker Unit on Saturday. On Tuesday, 29-year-old inmate Kenneth Jones was found dead in his cell at the Cummins Unit in Grady.

Officials say Brickner was serving a four-year prison sentence for forgery out of Sebastian County while Jones was serving a 25-year sentence for sexual assault out of Baxter County.

Arkansas Department of Correction spokesman Solomon Graves says the deaths will be investigated internally and by Arkansas State Police agents.

Authorities have not yet released the cause of death for either inmate.