NAVAJO, N.M. -- The FBI says one person has been arrested in the death of a nun on the Navajo reservation.

The arrest was made early Thursday morning in the town of Navajo, Albuquerque television station KRQE reported.

FBI spokesperson Darrin Jones did not release any further details on the arrest, but said he plans to release more information early Thursday afternoon.

Sister Marguerite Bartz was found dead in her home in Navajo on Sunday after she failed to show up for Mass. Her car was later found in eastern Arizona.

Police said they believe she was killed Halloween night or early Sunday morning.