GUADALUPE COUNTY, Texas - Three Guadalupe County detention officers are being investigated in connection with allegations of improper sexual activity with an inmate at the county detention center, the sheriff's office said Friday.

It opened the investigation Tuesday after receiving allegations of inappropriate conduct at the Guadalupe County Adult Detention Center.

In a news release, the sheriff's office said investigators found detention officers Andrew Kee and Isaiah Charles, along with corporal detention officer Rudy Garcia, " violated the civil rights of a person in custody by engaging in improper sexual activity" with the inmate.