Sorry to hear this news, very worrying indeed.
I almost became a victim of mugging on that bridge about 25 years ago, in broad daylight too, so it's nothing new, and always been a shockingly isolated location.
Thankfully it turned into a short fight in which time I got away from them. They were caught but the police too.

I hope something can be done about the safety of the place. I'm sure the SNT will indeed be keen to assist.