British knife crime

This afternoon t'son and his friend (both age 15) were mugged at the corner of our genteel suburban street, five houses up from our doorstep, by a man with a knife who took one of their phones.

I am shaken up about this. We had police in the house for 1 1/2 hours, taking statements and sending out descriptions. It is surprising how exhausting mental exertion is. I'm ready to drop into bed.