Back when Russia was marching through Belarus on the way to and from Kiev, There were reports that Belarusian railway workers were sabotaging Russian shipments. Maybe the explosions were caused by disident Belarusians, rather than Ukranians. There is an active extra-national patriots movement defying the stolen election last held. This led by the woman candidate people believe actually won.
Yes, this sounds like a local incident. Lukashenko is not very popular.