Fr. José Amaro Lopes de Souza, a priest connected with the Brazilian bishops' Pastoral Land Commission, was arrested and charged with extortion and money laundering.
Erileid Domingues said most of her indigenous village has, at one time or another, fallen ill due to contaminated water.
The Brazilian bishops' Indigenous Missionary Council criticized an April 30 attack in a remote area of Maranhao state that left 13 Gamela Indians injured.
Arns, known as the "cardinal of the people" and one of the most active voices against Brazil's military dictatorship, died in Sao Paulo Dec. 14.