Zambians are living in fear as police brutality increases and the southern African country approaches dictatorship, Zambia's Catholic bishops have said.

The bishops "are deeply saddened" by police officers' "unprofessional and brutal conduct," arbitrary arrests, "horrific torture of suspects," and the "careless, inflammatory and divisive statements of our political leaders," Archbishop Telesphore Mpundu of Lusaka, president of the bishops' conference, said in a statement.

"Anyone who criticises the government for wrongdoing is sure to have the police unleashed on him or her," the statement said.