A man and woman in their 50s were attacked at about 20:50 GMT, Greater Manchester Police said.
A British Transport Police officer was stabbed in the shoulder. The victims' injuries were described as "serious" but not life-threatening.
A man has been held on suspicion of attempted murder.
Officers said counter terrorism police were leading the inquiry, but they were keeping an open mind on the motive.
Гитлера победили, ну, а чорным подмахнули.