NORWAY HOUSE, Man. - Health Canada says it is offering free DNA tests following the discovery of four men who were switched at birth at a hospital in northern Manitoba.

The tests are being offered to anyone who was born at the federally run Norway House hospital in the mid-1970s.

Health Canada spokesman Eric Morrissette says he is not currently aware of any other cases of people who were switched at birth.

He could not say if anyone has yet requested the free DNA tests.

Morrissette says the department has started reviewing the hospital's historical files and an independent third party will soon be tasked to investigate the mix-ups.

Two men from the Norway House First Nation announced last week -- and two men from nearby Garden Hill revealed late last year -- that they had been switched at birth at the same hospital in 1975.