be on the scene
US /biː ɑːn ðə siːn/
UK /biː ɑːn ðə siːn/

1.
現場にいる, 登場する
to be present at a place where an event is happening
:
•
Police were quickly on the scene after the accident.
事故後、警察はすぐに現場に駆けつけた。
•
When I arrived, the paramedics were already on the scene.
私が到着したとき、救急隊員はすでに現場にいた。