would making a free high speed train directly from mumbai to a country be a declaration of war (biological warfare)?

[CelestialEmpire]

say china right before starting a war with the US constructs an underground high speed train directly from india to new york and makes it a one-way free trip for everybody boarding in the mumbai station (biological warfare). would the US see it an act of war?

 

[CelestialEmpire]

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