Federal and tribal law enforcement agents descended on a small community on the Navajo Indian reservation early Thursday to make an arrest as part of their investigation into the slaying of a nun whose body was found in her home on church property.

The FBI said agents arrested one person in Navajo, but refused to say how that person might be connected to the death of 64-year-old Sister Marguerite Bartz. The nun's body was discovered after she didn't show up as scheduled for Sunday Mass in a neighboring community.

FBI spokesman Darrin Jones would not say why federal investigators were not releasing any information about the arrest, and Samson Cowboy, the head of the Navajo Nation's public safety department, also declined to comment, saying only: "It's a very sensitive issue."

The FBI did confirm that the person arrested Thursday morning would remain in custody for the night.

News of an arrest has resulted in some relief for the community in northwestern New Mexico, said Lee Lamb, a spokesman for the Diocese of Gallup, which oversees the St. Berard parish in Navajo where Bartz lived.

"I'm sure that community hasn't been sleeping well for many nights. I think with this arrest they're going to have a better night's sleep tonight and feel a little safer in their homes," Lamb said.

Lamb said with the arrest, the community as well as the Sisters of the Blessed Sacrament _ the order to which Bartz belonged _ can focus on the nun's funeral, the grieving process and the celebration of her life.

Investigators also remained tightlipped about details of the crime, but said preliminary autopsy results show Bartz sustained substantial trauma, likely as a result of a violent confrontation with her killer or killers.

Jones said agents were withholding the specific cause of death while the investigation continues. However, he said there was no evidence to suggest Bartz was sexually assaulted or that she was targeted because she was a nun or for religious reasons. Continued...