Police in northwestern Myanmar have rejected a lawsuit filed by two Buddhist monks against Myanmar's home minister and police chief, saying they are protected by law.

In declining to accept a first information report, which is needed for a lawsuit to proceed, the police said no lawsuit can be brought against any officer who carries out acts in good faith.

Human rights lawyer Aung Thein said the two Buddhist monks, among scores seriously burned during a 2012 police crackdown on protests at a Chinese-backed copper mine, registered the first information report at the Hsalingyi police station.

Aung Thein, who works with Justice Trust, said a letter was also sent to President Thein Sein asking that the lawsuit to be opened against government ministers.