If you are able to asses the situation call for help if needed and render assistance to the victims.
you report it. Its the right thing to do!
The first thing to do - is raise the alarm. Whether that's activating a fire alarm - or reporting an accident to a tutor.
It depends on what sort of accident you're talking about. In a car accident, for example, you'd want to turn off your car first thing in case of fire.
The first 'thing' anyone sees when approaching Antarctica is ice.
Check to see if there are any casulties
Report it to someone in authority.
in my opinion you should tell the teacher immediately
stop and give whatever assistance is necessary
I recently saw a commercial from Allstate and they have an accident forgiveness program.