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

1.
ter plaatse, aanwezig
to be present at a place where an event is happening
:
•
Police were quickly on the scene after the accident.
De politie was snel ter plaatse na het ongeluk.
•
When I arrived, the paramedics were already on the scene.
Toen ik aankwam, waren de paramedici al ter plaatse.