I live in front of a bridge in Japan and every other weekend late at night I hear/see firetrucks and ambulances rushing to the river side. I've never seen anyo

I live in front of a bridge in Japan and every other weekend late at night I hear/see firetrucks and ambulances rushing to the river side. I've never seen anyone jump but I know it's happening. Sometimes there are flowers near where the person jumped. Whenever I cross the bridge and see someone standing by the edge I always wonder if they're there for that... I've never talked to anyone. I should.