premise: KIEV (Reuters) - Kiev has closed five subway stations, mostly in the central part of the Ukrainian capital, after a bomb warning, the subway operator said in a statement. “The stations are closed to passengers and checks are being carried out,” it said on Facebook. Kiev is hosting the UEFA Champions League final later on Saturday in which Liverpool will play Real Madrid.
hypothesis: No one knows why Kiev has closed five subway stations that are mostly located in the central part of the Ukrainian capital.
reason: My statement states that it not known why the stations were closed. The system was unable to identify this as false information.