first of all a big hug, xxxx
I was passing and saw that you had posted this. It is scary when that happens, so you arent being silly. And as you know some young people are "brave" in a group.
Right first things first, you did right not to go straight out.
Secondly, if you think they have gone and you feel up to it have a look at what theyve done. if you dont feel up to it thats ok.
Now have a think, jot down the name of the school, how many there were anything distinguishing about them.
Next ring up the police on 101, and tell them whats happened. they will take you seriously, honestly, i promise.
Tell them that you live alone and have disabilities ( no need for in depth explanation),
emphasise that you are scared,/ alarmed/distressed (important).
They will ask if they have gone, and will offer to send someone round from your neighbourhood police. Accept the visit, (say you want it inside school hours) they will come and do a bit of reassurance and possibly visit the school.
Dont ring the school yourself, they always handle things badly.
You might be given a reference or log number, make a note of it.
Dont feel silly about this.
I like young people, but sadly these idiots dont bloody think half the time, and they need to be made to think. The police will only do what you feel happy with.T
The neighbourhood police might be a day in getting back, or there might be a response car about and they come sooner.
Most important is that you have it logged. They will take it seriously. Dont shrug it off to them though
OK give it a go, you know where I am if you need me xxxx
More hugs, if you feel a bit shaky its shock, take care now xxxxxxxxx