Archbishop Samuel Kleda of Douala, conference president, said the bishops were "not satisfied" with investigators' findings that Bishop Bala drowned after he disappeared overnight May 31, three days before his body was found miles downstream from his abandoned vehicle.

The lawsuit was filed to "ensure truth is established," Archbishop Kleda told Radio France Internationale July 18.

"If he'd died from drowning, there would have been water in his body, but there was nothing. Instead, it was clear there were many marks of violence," the archbishop said as preparations were underway in Bafia for the Aug. 2 funeral for the 58-year-old bishop, whose remains were returned to the church July 17.

He said the bishops' conference also would file a complaint against unspecified officials for mishandling the case and would hand its file of evidence to lawyers acting on its behalf.

Bishop Bala's body was discovered by fishermen June 2 in the Sanaga River, four miles from a bridge where an apparent suicide note was found in his abandoned SUV.

The French-language African News Agency said media reports that he had committed suicide were rejected by church colleagues and questioned by police and justice officials.

The bishops' conference said in a June 13 statement that it was certain that Bishop Bala had been "brutally murdered," and it demanded his killers be "identified by name and brought to justice."

However, Cameroon's attorney general said July 4 no "traces of violence" had been found when the bishop's remains were re-examined in late June by German forensic pathologists in an Interpol-commissioned autopsy, which had concluded drowning was the "most probable cause" of his death.

Church sources told Radio France Internationale the Interpol claim contradicted two earlier local autopsies, June 2 and June 22, which had found "multiple fractures and wounds," as well as signs of electrocution.