An Issue at Work

Hello everyone, this is a small issue that I had at work last week.
First of all I am a bus driver, so last week on Friday I had a small accident. I was driving the bus as alway along a high road in the bus lane between Seven Siters Station and South Tottenham Station.  The bus stoped and suddenly I heard a noise. Immediatelly I decided to looked at my mirrors and I realized that there was no nearside mirror.
What I did first was to stop the bus at the next bus stop and tell people that the bus had a problem and I could not continue with the journey.  Then I called the controller to let him know about my problem and he just said to me, "OK, just wait there and an engineer will go to your position to replace the mirror."  I waited for him for 30 minuntes.  He replaced it and I could continue with the journey.
The thing is that I did not know what happened.  (I mean how the mirror got broken...) 
Before the engineer came to my position a roadworker came to my bus bringing the broken mirror and he explained to me what had really happend.  So, one of the roadworkers was working near the curb with a tool and he did a movement reaching my mirror.   (You might explain here that the tool hit the mirror and broke it off)  So, it was that moment when I really knew what had happend.  So, after finishing my shift I had to file an accident report, and tomorrow I have to see the manager of the company to confirm the incident.
Thank you very much for reading what I have written and thank you for you correction.
See you!